• AMG

Can you hear me now?

Updated: Sep 2, 2019


Cell phone signal boosters. Yes, we still live in an age where we need these things because there aren't enough cell phone towers in remote areas. Plenty of low or no coverage zones in Alberta.


What's your cell phone signal strength like in your area? No I don't care how many bars you have. That's a visual representation that is horribly inaccurate of what your signal strength actually is. I'm talking about decibels (dBm). Do me a favour and put your cell phone into test mode. "Why do I need to to that?", because it's crucial we have the numbers for testing purposes for pre and post boost comparison, "Oh, ok, so how do I do that?", glad you asked, see below...


For iPhone users running iOS 11 and higher try this:

Starting with iOS 11 and 12, Apple has hidden dBm readings in iPhone field test mode. However, depending on your iPhone chipset (Intel or Qualcomm) and your carrier there’s a slim chance to find your dBm readings through this workaround:


  • Dial *3001#12345#* (this is not a trick, trust me)

  • Tap LTE.

  • Tap Serving Cell Meas.

  • Your dBm is read as rsrp0.


For iPhone users running pre-iOS 11 try this:

  • Dial *3001#12345#* (again, not a trick)

  • Swipe down notifications bar.

  • Your dBm is in the upper left-hand corner of the screen.


For Android users try this:

Field test mode on Android varies by phone model and Android OS version. However, it is generally found under the Settings menu.

  • Tap Settings

  • Tap About Phone

  • Tap Status or Network

  • Tap SIM Status

  • Your dBm is under Signal strength

Now that you have your cell phone signal strength in dBm, use the following as reference:

  • -50 to -79 dBm, considered great signal (4 to 5 bars).

  • -80 to -89 dBm, considered good signal (3 to 4 bars).

  • -90 to -99 dBm, considered average signal (2 to 3 bars).

  • -100 to -109 dBm, considered poor signal (1 to 2 bars).

  • -110 to -120 dBm, considered very poor signal (0 to 1 bar).


Maybe check to see what carrier towers are closest to you as well. You can do that here at cellmapper.net


Alright, now you have a better understanding of cell phone signal strength, maybe it's time to have a certified installer outfit your fleet! AMG Automotive Installations is proud to be a SureCall Certified Level 2 Installer. Contact us for details!