Updating error iphone 4
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A hard reboot isn’t necessary, so simply turning the i Phone off and on should do the trick.
Instructions to force reboot the various i Phone models are further below under the additional troubleshooting steps.
You might be able to resolve the No Service cellular problem with i Phone by doing the following procedure of removing the SIM card and restarting the i Phone: Wait a moment and the i Phone should regain cellular service and the “No Service” error should go away.
Considering that an i Phone is a cellular phone, not having cellular connectivity is understandably annoying.
If the cellular problems are the result of a bug with an i OS version, then presumably a new update to i OS will fix the problem completely, though it’s unclear if and when that will happen.