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Finding Your Phone's Signal Strength Reading (Field Test Mode)

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Viewing your phone's actual signal strength reading is preferable to relying on the "bars" graphic as an indication of signal strength. The issue with the bars representation is that there are no standards. My phone's 3 bars may well represent a stronger signal than your phone's 4 bars or even 5 bars.

But we can't know that. So the best way to determine the strength of signal received by your phone is to view the signal strength reading. These readings are expressed in decibels (dBm), a standard unit of measure. They allow us to know when we are receiving a stronger signal or a weaker signal.

Please notice that signal strength is expressed as a negative number and can range from about -30 to -110. On certain phones, the number may show as positive in test mode. In such cases, convert it to negative. For example, 60 dBm is actually -60 dBm. The closer the number is to zero, the better signal your phone is receiving. Thus, a reading of -60 dBm is a stronger signal than -75 dBm. Some phones may show either a 1x/3G reading or a 4G/LTE reading at the top of the phone. 

It is important to know your carrier's signal strength, as this will help determine if you need a booster and where you need the boosted signal to go. Check out this video for tips on improving your cell signal:



Most Android phone models allow the user to view signal strength readings by navigating the device's menu tree. Finding the right menu screen varies across phone manufacturers, models and versions of Android OS. A typical navigation sequence is Settings – About Phone – Status or Network – Signal Strength or Network Type and Strength.

An alternate nav sequence for some Android phones is Settings – More Options or More Settings – About Phone – Mobile Networks – Signal Strength. Some experimenting with the menus on your Android phone should get you to the dBm reading.

If, after following the instructions above, you still can't see your phone's signal strength reading, check the operations guide that came with your device. Alternatively, there are apps you can download from the Play Store, such as SignalCheck Lite, which may allow you to read your signal strength as well. *Hint: look for the 1x or 3G signal for accurate results.*

Finally, if necessary, you may have to contact your phone manufacturer's customer support group for help.


iPhone models require the user to access the phone's 'Field Test Mode' in order to view a signal strength reading.


For use on an iPhone 5 and higher, running on iOS 9 or newer, go in to your Settings, then Cellular, then Cellular Data Options, then change the Enable LTE status to OFF (after testing you can go back in and turn the LTE back on or to Data Only):

  1. Dial *3001#12345#*
  2. Press CALL
  3. Hold the power button for about 5-7 seconds until you see the “slide to power off” screen.
  4. Do NOT power off the phone!
  5. Hold the home button (round button at the bottom) for about 5-7 seconds.
  6. It will return you to the home screen and the negative decibel reading will be at the top of your screen.

*If you do not wish for the negative number to be there permanently, you can dial the sequence again and just hit “back to phone” and it’ll return your phone to the dots/bars again.*

Thanks to a 3rd party, we have provided you a list of test mode instructions for other types of phones. To find a possible test mode for your phone (other than what's already been mentioned above), you can visit the following link:

To report any necessary updates for this information please contact WPS Antennas via one of the contact methods below:

            By email:

            By toll-free telephone: (877) 594-5766

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