How does Samsung S7562 set up that card to make phone calls and send text messages?

There is a SIM card manager in the settings. The data network on card 1 and card 2 selects Unicom card. In this way, you use Unicom card when surfing the Internet. As for making a phone call, drop down on the home screen and select a mobile card to make a phone call.

QQ, press the left button, there is an exit. You can quit if you choose.

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