Not necessarily. It depends on which bank your card belongs to. Every bank's is different. For example, China Merchants Bank can bind two mobile phone numbers, but not most banks. You can call the service hotlines of various banks for consultation.

The following are some points for attention when using the primary and secondary credit cards:

The main card and the auxiliary card of a credit card belong to the same account, and the credit limit is shared. Among them, all debts incurred by the deputy cardholder when using the credit card shall be borne by the main cardholder, and the main cardholder shall directly perform the debts to the card issuer or special unit.

In the relationship between primary and secondary cardholders, the primary cardholder is in a dominant position and has the right to decide to add or cancel secondary cardholders, while the secondary cardholder is in a subordinate position. If the primary card is cancelled, the secondary card should be returned to the card issuer voluntarily. When the cardholder of the primary card requests to stop using the secondary card, he should also return the secondary card to the card issuer, and the outstanding debt will still be borne by the cardholder of the primary card.

If the primary cardholder needs to cancel the secondary card midway, he has the right to recover the credit card from the secondary cardholder and return it to the card issuer. If the secondary card cannot be recovered, he can submit a written application to the card issuer to cancel the secondary card. However, before returning the secondary card or submitting the application, the creditor-debtor relationship arising from the use of the credit card by the secondary card holder will still be borne by the primary card holder, and the card issuer will not accept the economic disputes arising from the use of the credit card by the primary and secondary card holders.