The message was received late, and it didn't happen until I got home these days. Is it the phone or the operator?

Generally speaking, there are three possibilities. First, the problem of network congestion. Generally, during the peak period, such as the Spring Festival, when the number of short messages is large, the channel will be blocked and the short messages will be delayed. The second is the problem of your mobile phone or the card on your mobile phone. Some mobile phones will have this problem. You can try another one.

It should be your mobile phone, and so should mine. It's normal to change it now.