[lucaspiller]

There are also USSD menus which I hadn't heard of before going to Asia. It was used by carriers there to provide an alternative to voice menus to topup and buy addons. In India there is a company providing access to Facebook over it:

https://www.facebook.com/notes/airtel_in/airtel-launches-the...

[abritishguy]

USSD has very limited support outside Asia and US.