I'm a courier. I want to know what software is available on my mobile phone. Is it cheap to send text messages?

I think it's cheaper to send a software express with a small pole. New users can send 200 short messages and 20 group calls after downloading. Moreover, their short messages are charged according to the gradient, and there are often activities, with an average of two or three points. Activities are cheaper. I suggest you download more software and try it out before deciding which one to use.