Sending text messages by mobile phone means that sometimes you have to write letters or numbers to send them. How to write?

Different mobile phones change the input method in different ways.

Supplement: Do you mean the information desk or something?

If you need to send ABC+ number to 12586.

Then edit ABC5 and send it to 12586 (for example only)

I never send this kind of information ... it's expensive ... I'm poor-_-! !