What is the instruction for checking credit by SMS?

Edit the short message 7 18 and send it to 1000 1 to check the credit.

Telecom credit refers to giving users a certain overdraft consumption limit when they owe money; The credit line is the maximum telephone bill that users can overdraw. The user's overdraft consumption will be stopped when it reaches the credit limit, and all expenses of the user's overdraft consumption must be paid in accordance with the regulations.

Long-term credit: refers to the credit that is valid for a long time without setting the validity period. If the debt reaches the credit limit, the machine will stop.

Temporary credit: a temporary credit granted to users according to the urgent needs of customers, and the longest validity period is no more than seven days.

Non-credit control: refers to the services provided by the company to important customers. There is no credit control and no credit ceiling, and it will never stop unless it is artificially controlled. Generally, it is a collection of users, and in principle it is not open to non-credit control users.