You can check the signal strength of your Android phone by entering the following code in the phone’s dialer:
This will bring up the “Testing” menu. From here, select “Phone Information” and scroll down to “Signal Strength” or “RSSI” (Received Signal Strength Indicator). The number displayed will give you an indication of your signal strength, with higher numbers indicating a stronger signal.
Note that some phone models or carriers may have different codes or menus to access this information, so if this code doesn’t work for you, you can try searching for your specific phone model and carrier’s signal strength code.