Talk to your mobile provider and get a new SIM card (replace the old one) and test it on iPhone. 4. Restore iPhone This is not exactly a nice solution, but a recovery should definitely be one of the things you tried to correct for invalid SIM or SIM errors. If this white sticker has a red dot in the middle, it means that the sticker gets wet at some point and water damage may sometimes cause no SIM card - but not always. This will reset the network configuration to factory settings, which will fix software errors in the invisible processes that always run backgrounds and are responsible for managing the connection of the iPhone to the mobile network and other networks. I recommend using iTunes because before it updates iPhone, iTunes will automatically check if a mobile provider settings are available for iPhone and if it does iTunes If you do not have a SIM card from another network or you do not know the original network , you can use this service, Helps you check your iPh-A carrier and land check for iPhone 5. IPhones SIM card saves the small data that separates you from all other iPhone users over the wireless network and contains the authorization keys that iPhone can use to access voice, text, and data services you pay. Customers say: Hello John, Thank you for your expertise and, more importantly, for your kindness, because they almost look forward to my next computer problem. If the real SIM card is not working properly, and incorrectly appears. In the middle it would be good to buy the new SIM card or you will also get the same SIM number from the Care Center on the SIM card. The SIM card that you have installed on this iPhone comes from a wireless service provider that is not supported Activation Policy now assigned by Activation Server. Make sure that the iPhone takes the picture correctly and displays the name of the wireless service provider and the signal beams (circles?). 2. Reset network settings A trick that has worked for many who face SIM problems resets network settings. Iphone 7 Plus 128gb Unlocked Red more. Iphone Icloud Unlock For Free.