Indian Railways now offers a simple way to know the status of many services through SMS. This Rail enquiry services are NOT free. They are charged a premium of Rs.3/- message.
Here is how it works:-
1) For checking your ticket reservation status:-
SMS to 139.
e.g:- PNR 1234567890
2) For Seat Availability:-
SMS Train
to 139
e.g:- Train 2993 160708 080 011 3A G
3) To get the Train ticket Fare:-
SMS Fare
to 139
e.g:- Fare 2993 160708 080 011 3A G

Enjoy your Journey !