02-21-2020, 06:17 AM
The underlying method will be the AT commands, but doing it that way may cause confusion on the higher level interfaces. At the top you've got NetworkManager / ModemManager, or connman, depending on distro. In between those and the AT commands you have Ofono. These should be able to turn off the mobile data while leaving the voice/text interface on. I'd hope that would reduce power consumption, but it depends what's going on inside the modem firmware.
