Comment by posguy

The PinePhone uses a really old, slow modem (the Quectel EG25). Why not get a modern Snapdragon x62 like the RM520, drop it in a carrier board, root the modem and do all the shenanigans you want?

Useful links: https://github.com/natecarlson/quectel-rgmii-configuration-n...

https://github.com/carp4/qadbkey-unlock