Like what you’re reading? Get a great tech tip like this one delivered to your inbox every day. If this number at home or your office is low, it’s time for Step 4. Go through each list until you see an entry that contains rsrp. Open the Phone app and dial *3001#12345#*on the keypad. In a few seconds, you’ll see a mishmash of numbers. You can check your iPhone signal strength by using its secret Field Test mode. So, the closer that number is to zero, the better the phone’s signal. If the dBm approaches -120, you are located in what we fondly refer to as a “dead zone.” Anything better than -100 is considered a usable signal. Remember, your phone’s signal strength ranges depending on several factors, from any interferences to how far you are located from a cellphone tower. Your cellphone signal strength is measured in decibels (dBm).
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