Apple 13 always sends information from the sim card.

First of all, the physical failure of the sim itself is eliminated, and the card can be exchanged at the operator for free. If it can't be solved, you can refer to the following solutions: tools/materials: iPhone 13, iOS 15.3, local settings 15.3.

1. Enter the main interface of iPhone and click Settings-General, as shown in the figure below.

2. Click About this machine at the top of the general interface, as shown in the figure below.

3. Enter the local interface and click the operator network option below, as shown in the figure below.

4. The 4.iPhone system will pop up the operator file update, and click the update button, as shown in the figure below.