How does Xiaomi IV activate mobile phone cards?

The specific steps for Xiaomi 4 to activate the mobile phone card are as follows:

1. Insert the sim card into the phone correctly.

2. Open the short message, edit a short message, and then send it to operators or friends at will.

3. At this point, the SIM card has been activated.

Remarks: Authentication is required to activate the telecom mobile phone card. Please refer to the instructions on the back of the telecom card.