Google SMS Channels is one of the coolest service that enables you to send free alerts and messages to your subscribers containing your preferred content. For Indian subscribers it is completely free. 
Creating sms channels takes just a couple of minutes and you are ready to distribute your favorite content to you subscribers via mobile devices. For creating an account, you must verify your mobile number through a verification code sent to your mobile device. Once you have completed the verification process, you can create sms channels for your subscribers.
An ideal use of this service is to set alerts for your blog posts and keep your readers updated whenever any fresh content is posted on your blog. To get a taste of it, you can subscribe to my sms channel to get latest updates of my MintBlogger blog.
MintBlogger: Latest Post Updates By SMS (For Indian Subscribers only)
Free Updates by Email Free updates by RSS (What is RSS?)
