I wonder if i could di the opposite: make an iPad believe it’s an iPhone. I don’t see no reason why i couldn’t use my iPad’s built-in modem to make and receive calls. I mean, i could just bring my ipad and my airpods around and be done.
Assuming you're talking about the cellular modem - wouldn't you need to have a voice plan and a phone number, not just a data plan like you'd typically get for a tablet?