How to check the phone bill of last month by sending short messages?

Hello, Beijing Mobile has launched SMS billing service for customers. There is no monthly function fee, and you can provide your phone bill by sending long short messages, each with a maximum of 200 words. When the bill content exceeds 200 characters, you will receive multiple text messages.

KTDXZD is sent to 10086, and the long message billing service of this machine can be opened. It takes effect in the month of opening, and will not be accepted after the last day of each month 19.