How to use Yahoo!7 Messenger for SMS
Pricing details
Carrier charges may apply for sending or receiving text messages. Check your wireless plan for details.
Signing in from your phone:
(1.1) Using text messaging, address a text (SMS) to one of the codes below, which will vary by carrier:Carrier Code Optus 2277 Telstra 019834 Vodafone 126007 
(1.2) Then, text: in [Yahoo! ID] [password]. Do not include brackets. See an example.
Seen by your Messenger contacts(1.3) Your contacts will now see you as mobile.NOTE: If you sign into the product from your phone, some carriers will send you an SMS that says you’re logged in.
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If your Yahoo!ID is chatsalot77 and your password is 123456, your text should read: in chatsalot77 123456.
* Leave a space between in, your Yahoo! ID and your password, as illustrated.
Yahoo!7 Messenger for SMS is currently available in the following countries: See countries
Americas: