The error message further says “learn more at apple.com/support.” which is the URL of Apple’s main support page. This page does not offer any real help for this issue specifically.
If you are having an issue activating your iPhone after updating iOS or resetting your device, please try the following troubleshooting tips:
Please try each step until you resolve your issue:
1-Remove the SIM card and put it back again. Simply locate your SIM tray and insert a paper clip to pop open. Apple explains how you can do this. And then re-place your SIM card. If this doesn’t not work, then try to remove the SIM and turn off your device and now put the SIM in and then turn on your device.
2-Please follow the steps below:
Restart your computer
Open iTunes (make sure that you are running the latest version of the iTunes software. If not, update to the latest version of iTunes). If your computer is a Mac, go to Apple menu > System Preferences, then click Software Update. If your computer is a Windows PC, you may download and update it.
Connect your iPhone to your computer using the USB cable
Select your iPhone by clicking the iPhone icon
3-Update your Mac by going to Apple menu > System Preferences > Software Update.
4-Please follow the steps below:
Connect your iPhone to your computer
Open iTunes on your Mac
While your device is connected, force restart your iPhone. Here is how you can do that:
If your device is an iPhone 8 or later: Press and release the volume up and then volume down button and then press and hold the side (on/off) button until you see the recovery screen below. Do not release the buttons until you see the recovery mode screen.
If your device is an iPhone 7 or iPhone 7 Plus: Press and hold the side and volume down buttons together until you see the recovery screen. Do not release the buttons until you see the recovery mode screen.
If your device is an iPhone 6 or earlier: Press and hold the side and the Home buttons together until the recovery screen below appears. Do not release the buttons until you see the recovery mode screen.
You will be presented with two different options: Update and Restore
Choose Update and then follow the on screen instructions.
5– If your device is an iPhone 7, Apple has said that a small number of iPhone 7 models may experience this issue because of a hardware problem. Apple explains the problem here in more details. Model numbers A1660, A1780, and A1779 may experience this issue (please note that you may find the model number on the back of your device). If you think that your device is also affected, then simply contact Apple. Apple may have to replace your device.
If nothing above helps you, you may want to live chat with an Apple support representative or make a Genius Bar reservation.
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