Iphone unlock - international Sim will not work
I brought an iphone in November 2019 as part of a pre-paid service, had the service active for 6 months and then unlocked the iphone. When I check the IMEI on ATT it says the iphone is unlocked however when I try to insert an international sim card in to the phone, I am receiving a message saying the 'Sim card you have currently installed in this iphone is from a service provider that is not supported by under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iphone. Please insert another simcard from another supported service provider or request that this iphone be unlocked by your service provider.'