you live in Iran. The Iranian government has a ridiculous policy and they don’t allow iPhone 13 and above to have an antenna in Iran. In fact, our problem is that the phone that is turned on and the SIM card is inserted has an antenna for 30 minutes, and after that, the antenna is cut off and you can’t use it. Internet or even call, in Iran they say this phone is not registered. Now there is a trick to always have an antenna. Please help me if you have knowledge in this field.
Turning the airplane mode on and off in some cases causes the antenna to return. Turning off the phone works in some cases. Take out the SIM card, insert the SIM card into the phone that is registered (has an antenna) and make a call for one minute, then take it out and put it back in the phone. The antenna is disconnected in some cases. It works, but it is not permanent, changing the location causes it to break