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How to turn parents' telecom cards into secondary cards?

To set your parents' telecom card as a secondary card, you need to follow the following steps:

1. Open the telecom business hall APP and click "Settings" in the upper right corner of the "My" page.

2. After entering the settings, click "Account and Security".

3. Click "Home Network", and then add parents' telecom cards.

Through the above steps, the parents' telecom card can be successfully set as the secondary card.