Now, you can send SMS and chat for FREE with Singtel at http://sms.singtel.com/internetsms/.
Quoted from the official Singtel source:
SingTel’s Internet SMS Chat lets you chat online, real-time with friends and family with SingTel Mobile lines! At absolutely no cost, you can now send and receive SMS from your PC to a SingTel Mobile phone or device (up to 3 at a time) both locally and globally and the chat conversation can be viewed conveniently on your web browser!
To start SMS chatting on your PC to a SingTel Mobile phone or device, simply go through these 4 steps:
1. Register for a FREE account.
2. Login to Internet SMS using your email address and password provided.
3. Key in your friend’s SingTel Mobile number and click “OK”. A pop-up window will appear.
4. Type your message and click on “Send Message”. The message will be displayed on your pop-up window. At the same time, your friend will receive your SMS on their mobile phones and they can reply your message. The conversation will be captured on your web browser..