please repair may phone not working the network service
my phone we cannot installing or upgrade n new version then my network service are not working still going installing
iPhone 12
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Update phone
Click on this link
Update your iPhone, iPad, or iPod touch - Apple Support
Phone will not update
If your iPhone, iPad or iPod touch won’t update - Apple Support
User Tip updating iOS
Updating iOS: common issues and solutions - Apple Community
Cellular has no service or searching (but you need WiFi to update iOS)