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Airplane shuffle: restart services to find signal | iOS 11 Guide

Sometimes it looks like there’s no signal on your phone when you’re pretty sure there should be.

Simply turning your phone off and on again can bring it back to life and get a signal, but that takes time. Here’s a much quicker way to coax some signal out of the phone.

Turn on Airplane Mode from Control Center and then turn it off again. This restarts the network circuitry and will usually locate that missing signal.