"SIM not supported" is a common error message that can occur when using a mobile device such as an iPhone. This error message typically appears when a SIM card from a carrier is inserted into the device but the device is not compatible with the carrier's network.
There are several reasons why a device may display the "SIM not supported" error message, including if the device is carrier-locked or if the SIM card is damaged or not activated. Resolving this issue may involve unlocking the device if it is carrier-locked.
It is important to note that if the device is not compatible with the carrier's network, it may not be possible to use that carrier's SIM card on the device. In such cases, users may need to unlock the phone to use it with their current carrier.
