Good news is that my yahoo mail account is out of beta, but the bad news is that the much anticipated facility of sending message to mobile directly from mail interface does not seem to be working. I tried sending SMS to my Airtel number, and I am still waiting for it. Let me search through Yahoo help; maybe they have listed the supported networks. In the meantime, has anyone been successful in sending message to mobile, either to Airtel or to any other network? Let me know in comments.
Yahoo does support Airtel in India. If they support then how come I am not receiving any SMS? Here is a list of supported networks.
The catch is that you can message a number only four times. After that your friend has to send a reply before you can send messages to him. I think I will stick with Twitter.