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Send text messages with a mobile secondary card. Does the main card pay?

In fact, the secondary card is common with the main card, and both are an account, no matter how the two cards are used. All the money is deducted from the memory card. You can only get a secondary card when renting a house. How much can it cost at most and how long can it last? The auxiliary card is within the range set by the main card and can be used at will.