What text message does the mobile phone send to check the validity period of the phone bill

The mobile phone bill validity period system has been cancelled, so it is impossible to query the phone bill validity period through SMS.

Telephone charges usually refer to the prepaid expenses of mobile phones. When the phone bill balance is insufficient, it will cause downtime, which will cause the service provider to be unable to continue to provide services to users and use mobile phones.

The phone bill can be recharged in the business hall of the mobile phone card operator. You can also choose to recharge online. Online recharge generally has a discount of 0.5- 1%, but you can't participate in various activities in physical stores or business halls.