How to check how many messages have been sent by the mobile phone?

If you are a M-Zone user, send BYLCX to 10086, and then 10086 will automatically reply to a short message with the remaining amount of your short message and other information, with a charge of 10 cent each time.

In addition, some mobile phones have their own SMS counters, both Nokia and Sony Ericsson have them. If there is, go to them.