![]() First Solution: Check For iOS updates on your iPhone 12 If you are still getting the same error after verifying that the service is active on their end, feel free to follow the recommendations below. There are times when you get a new SIM and a new phone where activation may be late. If you are not if you have an active plan with your carrier, make sure to give them a call and verify the service for the SIM card is already active. Using a different SIM card other than what is supposed to work with your phone may result in those kinds of error messages. ![]() ![]() If this is the first time that you are inserting a SIM card on your phone and it prompts an alert saying “No SIM Card Installed” or “Invalid SIM Error”, make sure that the SIM card that you are trying to use is programmed to work with your device. What To Do If iPhone 12 Says Invalid SIM or No SIM Card Installed
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