A roaming mobile station which has left an MTX area and entered another area, shall automatically send an updating information to the new MTX. HLR/MTXH is either updated through a LUM from the new MTXV or through the registration in MTXH.

The HLR/MTXH informs the old MTXV by sending a Location Cancellation Message, LCM. The old MTXV answers by sending a Location Cancellation Accepted Message, LCA. This signalling makes it possible to clear data related to roamers that have left the MTX area in the visitors register of the old MTXV.