How to set primary and secondary cards

First of all, you need to have a mobile phone that supports dual cards. In the settings interface, enter the dual card and network settings, click Dial, and dial as the main card. After the primary card is set, the card that is not set is the secondary card. The primary card and the secondary card cannot belong to the same company. For example, the primary card is a telecom card and the secondary card can be a mobile card.

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