Does it cost money to open a secondary card with a mobile phone number?

Generally, mobile phone supplementary cards **cost money**, and the charging standards may differ between different operators in different regions.

Take China Mobile as an example. The card that charges for the secondary card is the primary card, and the card that does not require payment is called the secondary card. The monthly fees incurred by the supplementary card will be deducted from the main card, and the package is determined by the main card. Usually, the supplementary card needs to pay a monthly function fee of 10 yuan, and will also receive 100M domestic general traffic. In different regions and packages, the deduction methods may be different, but usually the charges for the supplementary card are independent of the main card, which means that the main card and the supplementary card will be billed independently, and will eventually be unified into one account for payment.

There may be differences between different operators, and specific charging standards may vary depending on the region and package. For specific information, please refer to the official website or consult relevant customer service.