nRF9160 supports controlling external RF components, for example the antenna tuner, with
the MAGPIO pins or MIPI RF Front-End Control Interface (RFFE) serial interface.
Example of configuring nRF9160 MIPI RFFE for external device
Commands in this section need to be given only after device power-up or in device production. If the AT+CFUN=0 AT command is given in the production phase, it stores the given AT command’s content to nRF9160's non-volatile flash memory.