The iPhone 6 had a signature fault with severed/broken traces under/near the broadband CPU. It would cause issues like “searching for service” and GPS issues. I would recommend taking it into a 3rd Party repair shop that specializes in microsoldering. Even if it does not require microsoldering, the techs that do it will know how to test components and verify if it is this issue or not.
This is , of course, just a guess based on the amount of phones displaying this issue that I’ve seen. Without seeing the phone in person, its impossible to diagnose.
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