About country lock
My country lock phone how to i unlock
iPhone 6s Plus, iOS 15
Question marked as
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.
If it is an 'older' iPhone, normally (in the EU) after 2 years the consumer has the right to ask that the carrier unlock the iPhone.