Indian Railways in collaboration with Google is now providing a 10 digit mobile number.
Just SMS your PNR number on this mobile number and instantaneously you will get your ticket’s current status along with all other journey related details.
The number is
No need to prefix 0 or +91.
Best of all, you don’t pay a premium charge for any of this, just the price of a standard SMS.
For more details: http://www.google.co.in/mobile/default/sms/#