ModemManager
https://modemmanager.orgModemManager may also be used in routers running openwrt (integrated with netifd as a new protocol handler), or to manage both voice and data in mobile phones running postmarketos (PINE64 PinePhone, BQ Aquaris X5, OnePlus 6…).
ModemManager - OpenWrt Wiki
openwrt.org › network › wanSep 29, 2020 · ModemManager. ModemManager is a service that automatically sets up and connects 2G/3G/4G/5G modems and provides a high level of abstraction when interacting with modems. A few examples of functionality offered by ModemManager are: initialisation of the modem. connecting to the Internet.