Android users can enter *#*#INFO#*#* on the phone app's numeric keypad to open a diagnostics tool, which includes a submenu that shows signal strength in dBm.

Android users can enter *#*#INFO#*#* on the phone app's numeric keypad to open a diagnostics tool, which includes a submenu that shows signal strength in dBm. It's handy for locating sweet spots and dead zones in my home.