How to fix No Service error on iPhone 7 Plus after iOS 11 update?

Asked 21-Oct-2018
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How to fix No Service error on iPhone 7 Plus after iOS 11 update?  



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When dealing with minor software difficulties on your iPhone, a simple reboot (soft reset) might do a lot of good. It is safe since it does not alter or wipe any vital data saved on your iPhone's internal memory. You may restart your smartphone with iOS 11 by going to the Settings menu.

Go to Settings-> General->Shutdown to accomplish this. Here's how to do a basic restart if you prefer:

1. For a few seconds, press and hold the Power button until the Slide to Power Off label displays.
2. Drag the slider to completely turn off your iPhone.
3. Press and hold the Power button for another 30 seconds, or until the Apple logo shows.
Wait until your iPhone has completely booted up before checking to see if the No service error has disappeared.

If the problem remains after the initial restart, try restarting your iPhone once more. Give it at least three tries to reboot.