Why does my family code member go abroad and my mobile phone receive registration information?

Local people get welcome information from different places. This situation is generally caused by the network delay of an operator, because you have been to or passed by that place before, and then you returned to the local area after the operator's network was detected, but the operator's network has been unstable, so it will still show that you will receive such a message when you pass by or have been to that place.