Why can't the mobile phone receive text messages? You can get a few after restarting, but you can't get them for the time being.

This is caused by the busy network of the service provider.

Messages you have not received will be temporarily stored on the server. The server will periodically scan whether you are turned on or not, so as to send you short messages. There are too many users and the network is busy (there are few service providers' base stations, or the load of base stations is too high), so I am too busy.

In this case, you can just call (not necessarily chase), that is, take the initiative to tell the server that you are online.