160by2 have offered a free SMS service from PC to mobile for some time, but now they have launched an iPhone free SMS app too.
The new app allows you to send free SMS to mobile phones within India and can be used in the following countries: the US, the UK, Canada, Singapore, Malaysia, Philippines, UAE, Kuwait and Saudi Arabia. In the US the app is only supported by AT&T users.
You can download the application from the iTunes store, and if you already have a 160by2 account the new app will work with your existing account.
The app will also work on the iPod Touch and the iPad.