You can already do many cell services over IP with LTE and 5G. I don't think phones can power a satellite link for very long. Starlink uses something like 50W

You can already do many cell services over IP with LTE and 5G. I don't think phones can power a satellite link for very long. Starlink uses something like 50W if I remember correctly? That would kill a phone in mere minutes. Receiving, like GPS, is easier than transmitting to the satellites.