My sim was not supported what should I do?
I need help to my sim cause if I insert a sim it says your sim is not supported
iPhone 6 Plus, iOS 12
See this Apple article: How to unlock your iPhone for use with a different carrier
How to unlock your iPhone for use with a different carrier - Apple Support
Apple can't unlock your iPhone for use with a different carrier. Only your carrier can unlock your iPhone.
You need to contact your Carrier.