Forbidden PLMN list (FPLMN)

Updated 27 October 2026

The forbidden PLMN list is a file on the SIM where the device stores networks that refused its registration with a permanent cause, such as ‘PLMN not allowed’. The device then stops trying those networks automatically. The file, EF FPLMN, is defined in 3GPP TS 31.102.

In practice

A network refused once, for instance before a roaming agreement was opened, can stay forbidden on the SIM. If a device ignores a network it should use, read and clear the list: file 6F7B with the AT command AT+CRSM, or a reset from the SIM platform.

Reference

• 3GPP TS 31.102

Related terms

• PLMN (Public Land Mobile Network)
• USIM (Universal Subscriber Identity Module)
• Steering of roaming
• AT commands

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