Chosen Solution
restore your iPhone using recovery mode is last thing that can try to activate it. Did you try it also? This method also did not work the problem is in the hardware.
You can’t activate it, if you have knowledge in Microsoldering than you need to reball the BB_RF (BASEBAND IC), usually iphone 7 with this problem are as a result of Audio IC problem when “Technicans” try to repair audio ic and mess up by heating mainboard for a long time. If you don’t have knowledge in Microsoldering the only option is to send it to a repair shop. Don’t waste your time restoring it it’s not a software problem.
