iPhone using foreign sim South Africa
My UK apple store bought iPhone wont accept my South African sim
iPhone 6s, iOS 12
Question marked as
What is the exact message you are seeing? If it is "SIM not supported" that means you did not explicitly ask for an unlocked phone when you purchased it. You will have to find out the carrier it is locked to and see what their unlocking policy is.
If it is a different message post back with the exact wording of the message.