Pilihlah layanan pesan instan.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Some instant messaging services, like AIM and Yahoo! Messenger, allow you to send instant messages to a cell phone. .  On AIM, all you need to do is add +1 and then the number in the recipient's name box. For Yahoo! Messenger, just type the phone number into the text box at the top of the window, and hit Enter