I know on Android devices you can dial ##DEBUG# to get the LTE signal strength (dBm). That doesn't work on the iPhone 5 though. Does the iPhone 5 have this feature? If yes, what do I need to dial to get the signal strength (dBm).
The iOS devices show the LTE signal bars (not voice all the time, regardless of connection) unlike the Android devices.
You can access the iOS field test menu by dialing *3001#12345#* then if you just press the HOME button it should leave the dBm visible instead of the bars until you restart your phone.