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.
iPadOS 26 brings the Phone app to iPad, so you can do exactly that now.
Long, long ago there were some jailbreak hacks to pull this off. It was some funky mess with swapping modem firmware and pulling in the iOS dialer, if I recall.
Closest thing you can get now is that they finally brought the dialer app to the iPad... I can sort of make calls now through my cellular iPad using my iPhone's voice account with the "wifi calling on other devices" feature.
An iPhone for $399? Preposterous