How to measure signal strength in Decibels on your cell phone? (2023)

How to measure signal strength in Decibels on your cell phone? (1)

A how-to guide for checking signal strength more accurately on Apple IOS and Android cell phones.

If you want to perform a diagnostic check for poor cell phone reception or if you want to know the strength of your cell phone's signal accurately, then you must set phone for dB reading because you need to be able to check the DB (decibel) strength of the signal dBm rating.

Sure, you can look at the bars and get an indicator as to how strong or weak your input and output will be, but this visual indicator is not very specific and is prone to change with the slightest shifts of the phones position. In addition, it does not update in realtime.

Therefore, you may notice 2, 3, 4, and even 5 bars but you cannot make a call. Or you may see 1 bar, or even no bar / no service message, but still you can make a call just fine. Being within your Carrier's coverage map is also no guarantee for cellular connectivity.

This quick guide will show you how to check your phone’s signal strength on both an Apple and an Android phone with more accuracy, considering inaccurate and finicky nature of antenna bars on cell phones.

(Video) How to Measure Your Cellular Signal Strength

This will also help you figure out whether the cell phone signal booster you installed is working or not?Please check signal strength by putting your phone in field test mode or make and receive calls to know if there has been improvement, before returning your installed kit on assumption that it does not work! It may be working fine, but your signal bars may not be reflecting improvement in signal strength.

The methods we will provide below only shows you signal strength of the service carrier providing service to your phone. If you need to know signal strength hitting your phone from all carriers, you will need a signal meter.

What does negative number cell signal mean?

A negative number as in cellular signal signifies the strength of the signal in decibels.

Why do the decibels matter?

If you think of the decibels on the phone as the detailed information to gain the best signal, then you will understand how the bars are really superfluous to understanding how your phone works. For example: If you purchase a cell phone signal booster that claims that it can boost your phones decibels up to 50 points, but your signal strength is reading at -157, your signal will still be pretty weak. However, if your phone is reading at -100 and you get the same booster, you will get a very strong signal (besides, the phone will never show you anything above a -50 on a phone).

  • Cellular signal strength is measured in decibels (dB), and typically range from -50 dB to -110 dB.
  • The dB scale is logarithmic. This means that every 3 dB increase doubles the power. For example, -67 dB is twice the power of -70 dB.
  • Every 6 dB will approximately double the coverage distance from antenna (or cell tower).

Scale of signal strength in decibels:

How to measure signal strength in Decibels on your cell phone? (2)

(Video) See your TRUE signal strength on iPhone

Please note that above 3G signal strength chart is close, but not the same for 4G/ LTE. See the differences shown below based onwhether measuring signal strength in dBm on a 3G network or 4G networkdue to comparatively better quality of the newer 4G LTE network signals in comparison to older 3G network signals:

What is a Good Cell Phone Signal Strength (3G & 4G)?

How to measure signal strength in Decibels on your cell phone? (3)

In brief, how to put your phone in field test mode to measure signal strength in decibels?

  • How to Enter Field Test Mode for iPhones Not Running iOS 11:

  1. Go into your Settings / WiFi / Turn Off WiFi.
  2. Check your iOS and:
    1. For iOS 9.3 and later go to Settings > Cellular > Cellular Data Options > Enable LTE > Turn Off LTE.
    2. For iOS 9.2 and earlier Settings > Cellular > Enable LTE > Turn Off LTE.
  3. Make a phone call to *3001#12345#* and press call.
  • How to Enter Field Test Mode for iPhones Running iOS 11:

    1. Go into your Settings / WiFi / Turn Off WiFi.
    2. Check your iOS and:
      1. For iOS 11 and later go to Settings / Cellular / Cellular Data Options / Enable LTE / Turn Off LTE.
    3. Make a phone call to *3001#12345#* and press call.
    4. Select Serving Cell Measurements and refer to the top item named Measured RSSI.
  • How to Enter Field Test Mode for Android

    1. Settings > More Options or More Settings.
    2. Tap on About Phone > Mobile Networks > Signal Strength
    3. Under Signal Strength you will see your dB reading. If you do not see it there you will see it under Network Type or SIM Status.

    Detailed Instructions:

    For IOS Apple Phones.

    It is important to state that you should not jailbreak your phone to find the signal strength. Yes, you will need to go into the hidden files on your phone, but such can be done without having to tamper with important files or actual framework of the phone. You will need to have administrator permissions on the phone (which just basically means that you know the password to access secure apps if you have that security measure activated on your iPhone). To find the decibels on your phone, follow the following steps:

    1. Find a place where you can make a call. If you’re in a dead zone, then this method may not work. You will need to have equivalent of at least one bar in order to access the information as you will have to place a call (if not, try other options stated below). For situations where you have used up your data or for places where there is no signal, you may need to try to access the signal strength data from a person who has the same make and model phone as you have. Do not use for example a 4G phone to find the information on the DB of a 2G or 3G phone. The data will not be the same because phones detect the signals they are capable of detecting such a 3G phone can detect 3G signals whereas a 4G phone will detect 3G and 4G signals.
    2. Call *3001#12345#* (then tap Call / Send button) - You may, or may not have to put the * sign in before you call the number, because it depends upon the phone model and how your phone is set up to send and receive calls. If one method does not work, try the suggested alternative method by dialing without asterisk. If neither of the sequenced numbers method work as stated above, then your version requires few more steps: Upon doing above, you will see option to tap on "LTE". Then tap on, "Serving Cell Meas". Then look for, "rsrp0"and its corresponding signal strength. "rsrp0"is the primary cell phone tower connected to your phone. "rsrp1" is the next closest one with the strongest connection. Both have their own cellular strength depending on distance, interference, and other measures. FYI, RSRP stands for Reference Signal Received Power with range from -45dbm (good) to -140dbm (bad). It is a variation of RSSI measurement. Among other measurements shown, you may also notice RSRQ measurement which stands for Reference Signal Received Quality with range from -40dB (bad) to -3dB (good) and SINR which stands for Signal to Noise Ratio (derived from desired signal divided by undesired noise) that can be, for example, +6 (ok) or -2 (poor) - but we talk about those in another blog post detailing all signal related acronyms to prevent going off-topic here. If all options listed above do not work, unfortunately, these “field test mode” methods to detect signal in decibels, may not be available for your version/ model of iPhone (usually international phones that require alternate codes to detect carrier reception). In this situation, download a signal testing application from Apple app. store ensuring that it reads and presents the information in decibels (be careful as some of these applications are not free).
    3. Tap on the bars to switch them to numbers - If you do not already see the numerical value in the top left corner where you normally see the “bars”.When you dial the number it essentially will access the field test of the signal strength. By default, the top left will show bars (similar to what you’re familiar with). When you tap on the bars, it will change to a number. At this point you can write down that number, or if you want to have this feature permanent on the phone you can continue with the test. It is advisable that you keep this feature as it will come in handy in the future should you wish to know this specific functionality of the device. Again, you can get a bit of information from the bars on the phone, but it is really only a visual reference and not specific, especially if you wish to use a signal booster to optimize the functionality of the phone and its signal strength. Touching “Menu” on most phones will turn off this “Field Test Mode” and normalize the functions of your Apple iPhone.
    4. Go to the slide to power off screen. Hold down the power off button ONLY until you see the slide to power off button. DO NOT POWER THE DEVICE COMPLETELY OFF. When you get to this screen, hit the home button and then tap on the bars to see the decibel reading of the signal strength. If you accidentally power off the device, do not worry. It should still have the application applied to the phone. However, if you find that the information does not show up on the top left of the phone as desired, repeat steps one through three.

    Understanding the decibel reading is really simple. The closer your signal is to zero the stronger the signal will be. The further or higher that the number is, the weaker your signal will be. Much like golf, you want to have the lowest score in this case.

    For Android Phones.

    Similar to iPhones, some Android phones allow access to test mode by punching in a few numbers or punctuations in the numerical keypad as follows:

    (Video) How to Put Your iPhone or Android in Field Test Mode for Signal Strength in Decibels

    • HTC: *#*#7262626#*#*
    • Samsung: *#*#197328640#*#* or *#0011#
    • Sony: *#*#*386#*#* or *#*#*585*0000#*#*

    However, even if those don't work, finding the decibel strength on an Android phone is still a very quick process. However, it may vary slightly based on the software layer used by Android phone manufacturer Samsung, HTC, LG, Huawei, Google Pixel, OnePlus, Sony, etc.

    1. Unlock your phone and turn off the automatic sleep function. Generally, the automatic sleep function will cause the screen to go black. And while this will not affect the running of the phone, it can be a bit frustrating seeing your reading if the phone is constantly going into sleep mode.
    2. Access the settings. Typically, your settings button will be on the Home screen of your phone. Hit the home button. The settings app will look like a cog wheel. Should you not see the settings app on the phone, look for a button that looks like an old push dial phone grid on a white background. Click on this and then find your settings tab.
    3. Go to the status section of your settings - From the status section of the settings you will see a signal strength. Depending on the phone that you have, the signal strength may be outside of the status settings. Regardless of the location being in either status or in the settings, the reading will be the same. The signal should be presented in decibels. It may also show you a percentage number showing the signal strength.

    Why is my reading in the negatives?

    Do not worry, there is nothing wrong with your phone if you see that there is a – sign in front of the decibel reading. This is just the way in which the information is presented. In other words if the phone is receiving a signal of 107 it will read -107 (which is really weak for a phone). Ideally, you want to have your phone reading between -50 and -80. The further you go from zero, the weaker your signal will be.

    Minimum Signal Strength Needed For Talking & Data Transfer.

    What is the minimum signal strength needed for holding a conversation and data exchange over a cell network? While not as much required as needed for holding a cellular conversation (-100dB), atleast -100 dB is still required for data transfer to occur while maintaining the 4G or LTE speeds. As the strength deteriorates past that point on to -105 dB, -110 dB, -115 dB, and even -120 dB - The wireless data transfer speed will slowly come to a grinding halt.

    Boosting the signal strength.

    If you want to boost your cell phone signal strength, then it is important that you first check to see if the signal is weakened by the structure of the building (such as construction materials like concrete, metal, other wires and such), the region in which you reside/work (which may have antennas, boosters, and interference from adjacent buildings and such), or if the phone is corrupted in the .net or framework. To check the structure of the building, see if your signal increases when you are in your home or office. Should you find that the signal is greater on the exterior then the interior, then a cell phone signal booster may be appropriate for your home/office to boost the decibels on the phone. However, if you find that the signal does not fluctuate when you are inside or outside of the building it may be that you are too far from a tower/network in order to get a signal. If this is the case, check your phone at various locations to see if the signal changes at all. Should you find that the signal does not change regardless of your position, it may be that your phone’s software has a glitch and the phone may need to be reset to manufacturer factory settings. If that does not work, the circuitry may be damaged in which case you will want to, and need to, replace the phone in order to get the best signal.

    Keep in mind that your signal strength is not your WI-FI strength. Yes, you can boost your upload and the download speeds on your phone by eliminating the dropped calls and optimizing the performance of the phone, but if the wi-fi is lacking you will need to either use a wi-fi booster or get an all in one booster for your phone. Additionally, you will need to calculate the space in which you need to boost. Should your space be lower than 5,000 feet, a personal home booster is appropriate. Anything over 7,500 sq. ft. may require multiple boosters or amplifiers or will need to have a commercial booster.

    (Video) iPhone Field Test Mode Signal Strength Indicator

    Need help in finding your phone’s DB more accurately? Ask us.

    There's a tool called "Signal Meter" that can make it easy to check dB in any spot easily. Or see the video below to see how it works. Knowing the inside and outside functions of your phone is important to have the phone working at its best. However, we understand that you may have questions in how to boost your cell phone signal. would like to help you address these questions. You can reach us by either going to our website and sending us an email, or you can reach us directly through our phone line. Should you need to purchase a cell phone signal booster, our team of professionals can help you find a cell phone signal booster that meets your needs such as your space requirements, your phone’s compatibility, and the best model to keep your phone working (regardless of whether it is an IOS Apple phone or an Android phone) with the strongest possible decibels.

    Comparison of signal strength in decibels vs. bars vs. practical experience.

    Signal strength is represented in -dBm format in the chart below from -60 to -110. This is the power ratio in decibels (dB) of the measured power referenced to one milliwatt. That means the closer the value is to 0, the stronger the signal. For example, -60dBm is better signal strength than -110dBm.

    Signal Strength in dBmPractical Signal Strength
    Greater Than -60 or 5 Bars.Excellent signal. No chance of dropped calls. Optimal voice quality and data transmission speed.
    -60 to -75 or 4 Bars.Very good signal. Unlikely to experience dropped calls or quality issues that affect performance. This is usually the best available signal unless you're directly next to a cell tower or a signal booster interior antenna.
    -76 to -90 or 3 Bars.Good signal. While reliability and quality are generally adequate, interruption by building materials or other obstructions while moving could quickly deteriorate signal.
    -91 to -100 or 2 Bars.Fair signal. However, voice quality and data transfer speed may be noticeably affected. Dropped calls are more common.
    -101 to -110 or 1 Bar.Poor signal. Dropped calls and extremely slow wireless data transfer speed are constant problems.
    Less Than -110 or No Bars / No Service.No signal. There's no wireless connectivity possible without a custom solution.

    How to measure signal strength in Decibels on your cell phone? (4)

    (Video) How to check actual network signal strength of your android phone?

    Since cell phone boosters require some signal in order to boost it or multiply it many times, there needs to be atleast "poor" or "weak" signal outside where donor antenna can be placed. Therefore, you can deduce from chart above that the minimal amount needed must be atleast within -101 to -109 dBm if on 3G network, and within -111 to -119 dBm on 4G / LTE network. However, the best estimate would be the median of those two which is approx. -105 dBm on 3G and -115 dBm on 4G LTE. This is absolute minimal signal strength in decibel milliwatts that is needed outdoor for any cell phone signal booster to help improve reception indoor to any minimum extent.

    What if you do not have enough signal to use signal booster?

    If you cannot garner minimal signal strength as stated using your directional antenna (survey kit), a cellular booster, bi-directional amplifier (BDA) or RF repeater will not work. In such instances, you may submit location details for a custom signal enhancing solution that would include a Small Cell, Microcell, Femtocell or active distributed antenna system (Active DAS). A site survey by team will be required to suggest the most effective solution that will resolve your wireless connectivity issues permanently.


    How to measure signal strength in Decibels on your cell phone? ›

    Cell phone signal strength is measured in decibels (dBm). Signal strengths can range from approximately -30 dBm to -110 dBm. The closer that number is to 0, the stronger the cell signal. In general, anything better than -85 decibels is considered a usable signal.

    What dB is a good cell phone signal? ›

    Cell phone signal strength is measured in decibels (dBm). Signal strengths can range from approximately -30 dBm to -110 dBm. The closer that number is to 0, the stronger the cell signal. In general, anything better than -85 decibels is considered a usable signal.

    How do you read dB signal strength? ›

    Signal strength is represented in -dBm format (0 to -100). This is the power ratio in decibels (dB) of the measured power referenced to one milliwatt. The closer the value is to 0, the stronger the signal. For example, -41dBm is better signal strength than -61dBm.

    How do I check my phone antenna strength? ›

    Settings –> More Options (or More Settings) –> About Phone –> Mobile Networks On this screen, view Signal Strength.

    How do I check dBm on my iPhone? ›

    Key in *3001#12345#*.
    1. Hit the green call button. Your iPhone will take you to the Field Test menu.
    2. From the Field Test menu, select 'LTE' and then head to 'Serving Cell Measurements,' which should be on the next page.
    Sep 27, 2021

    How many dB is a normal phone? ›

    Audio devices and mobile phones including iPhone have a sound level of 100 dB or louder. iPhones can produce a maximum of 115 decibels (software limits European iPods to 100 dB; U.S. models have been measured higher), the equivalent of attending a rock concert amplification.

    How many dB is a phone ringing? ›

    Studies found that ringtones average 60 decibels from five meters away. At one meter away, phones ring at 76 decibels, and the sound intensity can rise up to 128 decibels when a mobile phone is placed beside the ear!

    How do I know my dB level? ›

    The easiest and most accessible way to measure how loud your headphones are is by using a sound pressure level (SPL) meter. You can either use a physical decibel meter, or an application on your phone (here's a highly-rated one for Android and a NIOSH-developed one for iOS).

    Which phone has best signal strength? ›

    According to another PCMag study, the Android with the best reception is the Samsung Galaxy S22 series.

    What are acceptable dB levels? ›

    The U.S. Environmental Protection Agency (EPA) and the World Health Organization (WHO) recommend maintaining environmental noises below 70 dBA over 24-hours (75 dBA over 8-hours) to prevent noise-induced hearing loss.

    How do I check my signal strength on my Android phone? ›

    How to Check Phone Network Signal Quality
    1. 1] On your Android device, open Settings and scroll down to the bottom.
    2. 2] Click on About Phone and select Status.
    3. 3] On the following screen, tap Network, and you'll be able to see signal strength for the SIM card operators on your device.
    Apr 28, 2023

    What is the range of a cell phone antenna? ›

    On average, the maximum usable range of a cell tower is 25 miles. While the typical coverage radius of a cell tower is 1 to 3 miles and in dense urban environments, a cell tower usually reaches 0.25 miles to 1 mile before handing off a user's connection to another nearby cell site.

    How can I boost my cell phone signal for free? ›

    How to Boost Cell Signal for Free
    1. Toggle Airplane Mode / Restart Your Phone. ...
    2. Use WiFi Calling. ...
    3. Go Outside. ...
    4. Remove Obstructions. ...
    5. Change Your Location. ...
    6. Ensure Phone Software and Carrier Settings are Up to Date. ...
    7. Keep Your Phone Charged. ...
    8. Check for Damage to Your Phone.
    Jan 24, 2023

    How do I check my dBm? ›

    Field Test Mode for Android Users
    1. Tap “Settings”
    2. Tap “About Phone”
    3. Tap “Status” or.
    4. “Network”
    5. Tap “SIM Status”
    6. Your dBm or rsrp can be found under “Signal strength”
    Mar 22, 2023

    What dBm is good signal strength? ›

    This value is represented as a +dBm value. In general, you should have a minimum of +25dBm signal-to-noise ratio. Lower values than +25dBm result in poor performance and speeds.

    What is the signal strength of 5G? ›

    5G can operate in the millimeter wave (a super high frequency spectrum that ranges from 24 to 100 GHz), where the amount of spectrum available for 5G means data can be transferred much faster than is currently possible.

    Are cell phone decibel meters accurate? ›

    The answer is, “Yes,” but only four apps that were tested measure up. The National Institute for Occupational Safety and Health (NIOSH) evaluated the apps at its acoustic testing lab. The tests also compared results for i-Phones and Android phones.

    Is 50 dB Loud for a phone? ›

    50 decibels is a safe, quiet noise level comparable to the following common sounds: A quiet conversation. A quiet office or home.

    What level of dB is bad? ›

    But any sound that is loud enough and lasts long enough can damage hearing and lead to hearing loss. In general, sounds above 85 decibels (dB) are harmful.

    How many decibels is iPhone ringer? ›

    There's also an option to limit the maximum volume. Go to Settings > Sounds & Haptics > Headphone Safety. There, you can toggle on Reduce Loud Sounds. This should be automatically set to 85 decibels (described as "as loud as heavy city traffic"), but you can go up to 100 decibels ("as loud as an ambulance siren").

    How loud is too loud decibels? ›

    Experts estimate that noise levels above 105 decibels can damage hearing, if endured for more than 15 minutes each week. Keep in mind that even noise levels between 85 and 90 decibels can cause permanent damage with extended exposure.

    How much is 70 decibels on phone? ›

    70 dB is in the middle of this decibel range. It is equivalent to the sound level of a regular washing machine. It is also equivalent to the noise level in an office environment or inside a car driving at 60 mph.

    What is the highest dB you should listen to? ›

    Experts and audiologists suggest keeping the sound levels at somewhere between 60-85dBs to minimize the risk of causing hearing loss by damaging your ears. If you are listening to music that is around 100dBs, restrict your usage to about fifteen minutes.

    How do I calibrate my phone dB meter? ›

    Calibrating Your Device
    1. Get something with a speaker. ...
    2. Put the 2 devices at the same distance of the speaker, with the microphones facing the speaker. ...
    3. Play the calibration tone and adjust the volume so the Sound Level Meter or the calibrated phone say that the level is between 60-70 dB to use as reference.

    What dB is a gunshot? ›

    Almost all firearms create noise that is over the 140-dB level. A small . 22-caliber rifle can produce noise around 140 dB, while big-bore rifles and pistols can produce sound over 175 dB.

    How can I make my cell phone signal stronger? ›

    Make Sure Your Phone is in Peak Working Condition
    1. Update your software. ...
    2. Turn off any services you're not currently using. ...
    3. Change your Voice and Data settings. ...
    4. Turn airplane mode on and off. ...
    5. Reset your network settings. ...
    6. Manually re-select the network operator. ...
    7. Have your phone checked for damage.
    Mar 23, 2023

    Do older cell phones have worse reception? ›

    The older your phone is, the less likely it will be compatible with the newest software updates, and the software updates are what keep your phone's signal capabilities current. So, in general, older phones get worse reception than new ones.

    What is the strongest signal strength? ›

    What is a good signal?
    • -30 dBm: This is the maximum signal strength. ...
    • -50 dBm: This is considered an excellent signal strength.
    • -60 dBm: This is a good signal strength.
    • -67 dBm: This is a reliable signal strength. ...
    • -70 dBm: This is not a strong signal strength. ...
    • -80 dBm: This is an unreliable signal strength.

    What is a good 5g signal in dB? ›

    What's a Good Signal Strength for a Cell Phone?
    Signal StrengthGeneral Results
    -50 to -79 dBmConsidered great signal (4 to 5 bars)
    -80 to -89 dBmConsidered good signal (3 to 4 bars)
    -90 to -99 dBmConsidered average signal (2 to 3 bars)
    -100 to -109 dBmConsidered poor signal (1 to 2 bars)
    1 more row
    Feb 23, 2023

    What is a good dBm for LTE? ›

    -80 dBm to -90 dBm

    How much is 60 decibels on phone? ›

    60 dB is the equivalent of a normal conversation level.

    What is a bad signal strength? ›

    -80 dBm: This is an unreliable signal strength. You may be able to connect to your network, but you will not support most online activity. -90 dBm: This is a bad signal strength. You are not likely to connect to internet at this level.

    How can I make my 5G signal stronger? ›

    How Can I Improve My 4G LTE or 5G Speed?
    1. Get a New Phone/Hotspot. If you're using an old device, a new phone or hotspot may allow you to connect to new bands. ...
    2. Use External Antennas [Best for Hotspots] ...
    3. Use a MIMO Signal Booster [Best for Phones]
    Jan 23, 2023

    How accurate are mobile phone decibel meters? ›

    They found an overestimation of the levels for numerous uses of some applications (i.e., SPLnFFT Noise Meter, SPL, SoundMeter, Advanced Decibel) and an underestimation for one application (dB volume). In our case, there was an overestimation or underestimation of more than 3 dB for all applications except NIOSH.

    What decibel range is too loud? ›

    Sound is measured in decibels (dB). A whisper is about 30 dB, normal conversation is about 60 dB, and a motorcycle engine running is about 95 dB. Noise above 70 dB over a prolonged period of time may start to damage your hearing. Loud noise above 120 dB can cause immediate harm to your ears.

    What decibel is too loud for Neighbours? ›

    For residential environments, the accepted decibel level is lower. Any noise exceeding 70 dB is considered disturbing. Residential limits usually start at 60 or 55 dB (the equivalent noise of a regular vacuum cleaner).

    How can I improve my mobile signal strength? ›

    Make Sure Your Phone is in Peak Working Condition
    1. Update your software. ...
    2. Turn off any services you're not currently using. ...
    3. Change your Voice and Data settings. ...
    4. Turn airplane mode on and off. ...
    5. Reset your network settings. ...
    6. Manually re-select the network operator. ...
    7. Have your phone checked for damage.
    Mar 23, 2023

    Is LTE better than 4G LTE? ›

    So what's the difference between 4G and LTE, and is 4G or LTE better? In short, 4G offers a much faster speed, more stability and access to a larger variety of online activities. LTE is a half-point between 3G and 4G, so its performance suffers compared to the fourth generation.

    What is the maximum decibel level on iPhone? ›

    In the Headphone Safety screen (shown below), turn on Reduce Loud Sounds and set the limiter. If you listen less than eight hours a day, you can keep it at 85 decibels. Otherwise, turn it down to 80 decibels.

    How many dB is a hair dryer? ›

    Although there are other types of noise produced by objects that are louder than a hair-dryer (80-90dB), it is still important to be aware of the noise output. The noise that comes from hair dryers is somethingmost people do not identify as loud, but it can still cause hearing loss or damage.


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