How does iphone4 check the number of SMS messages sent?

1. Unicom: You can send any content (such as "Hello") to 100 10 through Unicom SMS inquiry, and make customer service inquiry according to the received prompt message/dial 100 10.

2. Move: You can customize dynamic and convenient query. You get two messages a week, which seems to be a dollar. If you don't want to spend money, you can call 10086 to inquire.