How to query the access year of China Mobile GSM?

You can dial 10086 directly to enter the manual service, and you can check the access time of the mobile phone card. However, if you switch to GSM halfway, it will not be found out after more than 6 months.

10086 customer service hotline provides you with business services such as business consultation, business acceptance, complaints and suggestions on mobile communication through manual, self-help voice, SMS, fax and email.

Reminder: Mobile phone customers in China are free to call 10086 in China (the long-distance charges arising from the call are charged according to the actual situation), and the calls to 10086 are free.