Mr. SIF was after a new sim card for his phone as his current one ... if its deemed to be caused by the user then we won’t replace or fix it for free, it would be at the customers expense.

This is the modern way of activating a SIM card on a new device, and it will likely replace physical SIM cards. The possibility of removing the physical SIM card tray from our devices is no longer ...

Power down the phone, then replace the old SIM card with a SIM from a different network. Check that the iPhone is able to connect a phone call over the new network. That’s the short version ...