Clear the FPLMN (forbidden networks) list

About the FPLMN list

The FPLMN (Forbidden Public Land Mobile Network) list is stored on the SIM and contains networks the device should avoid.

Caution: Only clear the FPLMN when instructed by Hologram support or your device vendor. Doing this at the wrong time can disrupt registration.

AT+CRSM=176,28539,0,0,12

If the response shows 24 Fs, the list is empty:

+CRSM: 144,0,"FFFFFFFFFFFFFFFFFFFFFFFF"

Before writing, set minimal functionality if required by your module:

AT+CFUN=0

Write exactly 24 Fs:

AT+CRSM=214,28539,0,0,12,"FFFFFFFFFFFFFFFFFFFFFFFF"

Warning: Include exactly 24 Fs in the payload.

Restore full functionality afterward:

AT+CFUN=1