Joke Collection Website - Blessing messages - Why does Apple's 4s mobile phone display its name instead of the number when it receives a text message, and the name is displayed when it calls?

Why does Apple's 4s mobile phone display its name instead of the number when it receives a text message, and the name is displayed when it calls?

1. The name is not in the phone, but on the sim card.

2. The name exists in both the mobile phone and the SIM card, and the setting only shows the mobile phone to solve the problem.

3. There is a software conflict. See if there is any software with functions such as address book installed. . .