Joke Collection Website - Public benefit messages - Why did my phone switch to sim card center 1 after it was turned off?

Why did my phone switch to sim card center 1 after it was turned off?

First open the information, then click Settings, then click SMS, then enter the information center and set the number of the information center according to your area.

Telephone number of information center +86 1380××××500

Enter your local four-digit area code at X. If the four-digit area code is insufficient, add 0.