Section: 5.3.3 List of forbidden PLMNs for attach in S101 mode
Content: A UE supporting S101 mode shall store a list of "forbidden PLMNs for attach in S101 mode". The UE shall erase this list when the UE is switched off or when the USIM is removed. In S101 mode, the UE shall add to the "forbidden PLMNs for attach in S101 mode" list the PLMN identity provided with the indication from the lower layers to prepare for an S101 mode to S1 mode handover whenever an ATTACH REJECT message is received with the EMM cause #11 "PLMN not allowed", #12 "tracking area not allowed", #13 "roaming not allowed in this tracking area", #14 "EPS services not allowed in this PLMN", #15 "no suitable cells in tracking area", or #35 "Requested service option not authorized in this PLMN" as specified in clause 5.5.1.2.5. The maximum number of possible entries in the "forbidden PLMNs for attach in S101 mode" list is implementation dependent, but the list shall accommodate at least one PLMN identity. When the list is full and a new PLMN identity has to be inserted, the UE shall delete the oldest PLMN identity.