HOW CAN I ACTIVATE MY IPHONE
HOW CAN I UPDATE MY IPHONE AND ACTIVATE IT
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See -> If you can't activate your iPhone or iPad (Wi-Fi + Cellular)
If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support
Then try to do the update.
Check -> iPhone type & iOS version -> Go to Settings -> General -> About.
Go to Settings -> General -> Software Update -> Download and Install.