SMSJunction now offers free SMS to BSNL Mobiles all over India!!! The Following Networks in BSNL are covered:

BSNL A&N 9479, 9432
BSNL AP 9473 , 9440, 9441
BSNL Assam 9478
BSNL Bihar 9475, 9431
BSNL Chennai 9470, 9444
BSNL Kolkata 9481
BSNL Gujrat 9457,9426
BSNL Haryana 9450, 9416
BSNL HP 9451,9418
BSNL J&K 9452,9419
BSNL Karnataka 9471, 9448
BSNL Kerela 9472, 9447
BSNL MP 9458,9425
BSNL Maharastra 9456, 9422
BSNL NE 9477
BSNL Orissa 9476, 9437
BSNL Punjab 9453, 9417
BSNL Rajasthan 9459, 9414
BSNL TN 9480, 9443
BSNL UP(E) 9455, 9415
BSNL UP (W) 9454, 9412
BSNL WB 9474, 9434

Please note that the BSNL user whoom you are sending messages to should be subscribed to UMS (UNIFIED MESSAGING SERVICE) system of BSNL.

Details of BSNL UMS can be found at the following link:

http://www.bsnl.co.in/service/mobile_ums.htm