SMS notification from Google Calendar is now available in India and that too FREE. As of now, only two Mobile Operators Hutch and Airtel are supported, may be more mobile operators would be added soon.

You need to go to settings in Google calendar and then have to give your mobile number and choose your mobile operator. You will receive an SMS with a verification code. Just submit your verification code and Voila!!!! you will now receive reminder notification through SMS, but do not forget to check the SMS box in order to get reminder notification.

When you receive verification SMS, it says " standard charges apply for each SMS" but you need not to worry because as par google Calendar FAQs, your mobile service provider's standard rate for receiving text messages will apply. We are not charged for receiving SMS, so it seems that it's FREE service.