How to fix SIM not supported on iPhone 4?
iphone 4 sim not support fs
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[Re-Titled by Moderator]
Windows, Windows 10
Your phone is locked to a different carrier. You need to contact the carrier the phone is locked to and ask them to unlock it.
Note: if you don't have service with that carrier, they probably won't unlock it.
How to unlock your iPhone for use with a different carrier - Apple Support