An ID card has two mobile phone numbers. Can you check whether the SMS fee is for two cards?

You can consult the customer service staff, go to the business front desk of the communication company, or log in to the online business hall.

The system used by the communication company will automatically detect the information of an ID number in the system. You just need to provide your certificate, and the communication company will check it for you. Log in to the online business hall where you belong, go to Personal Information Management → Personal Information → One-Card Multi-Machine Inquiry, and find all the mobile phone numbers where you have used your ID card. The customer service staff of the three major operators said that an ID card can open multiple numbers in China, and the upper limit is different. Among them, China Mobile has five numbers, China Unicom has five 2G numbers, five 3G numbers (beginning with 186) and China Telecom has three numbers.