The time displayed by the text message received by the mobile phone.

Have you ever tried texting yourself? If not, you can test it yourself. Everything will be clear.

Of course, if you have two mobile phones in your hand, you can test them more.

Generally, the time in the mobile network shall prevail. As for whether it is Beijing time, only they know. Just like when you charge by phone, there is a call start time record on it (in fact, they don't know the setting time of your mobile phone), they just follow the call signal of the mobile network. Therefore, the time on the mobile phone can only be the watch timing function, which has nothing to do with any other behavior of you. Everything is based on the time of the mobile network platform.