Sending SMS freely, all we have know is the operator and the area of the service. From your webmail like Gmail, Yahoo, Hotmail or Rediff and send email to the MobileNo@OperatorWebsite.com and the mobile user receives it as a normal SMS, but "from" will show your email address rather than mobile number. I use Aritel AP and the messages are delivered instantly like the normal SMS. If you have to send message to an Airtel Mobile in AP just send email to MobileNo@airtelap.com.
Andhra Pradesh AirTel----------- mailto:NMobileNo@airtelap.com
Andhra Pradesh Idea Cellular----- MobileNo@ideacellular.net
Chennai Skycell/Airtel------------MobileNo@airtelchennai.com
Chennai RPG Cellular-------------MobileNo@rpgmail.net
Delhi Airtel-----------------------MobileNo@airtelmail.com
Delhi Hutch-----------------------MobileNo@delhi.hutch.co.in
Gujarat Airtel---------------------MobileNo@airtelmail.com
Gujarat Idea Cellular--------------MobileNo@ideacellular.net
Gujarat Celforce/Fascel-----------MobileNo@celforce.com
Goa Airtel-------------------------MobileNo@airtelmail.com
Goa BPL Mobile-------------------MobileNo@bplmobile.com
Goa Idea Cellular------------------MobileNo@ideacellular.net
Haryana Airtel--------------------MobileNo@airtelmail.com
Haryana Escotel-------------------MobileNo@escotelmobile.com
Himachal Pradesh Airtel-----------MobileNo@airtelmail.com
Karnataka Airtel-------------------MobileNo@airtelkk.com
Kerala Airtel-----------------------MobileNo@airtelkerala.com
Kerala Escotel---------------------MobileNo@escotelmobile.com
Kerala BPL Mobile-----------------MobileNo@bplmobile.com
Kolkata Airtel---------------------- MobileNo@airtelkol.com
Madhya Pradesh Airtel-------------MobileNo@airtelmail.com
Maharashtra Airtel-----------------MobileNo@airtelmail.com
Maharashtra BPL Mobile-----------MobileNo@bplmobile.com
Maharashtra Idea Cellular----------MobileNo@ideacellular.net
Mumbai Airtel----------------------MobileNo@airtelmail.com
Mumbai BPL Mobile----------------MobileNo@bplmobile.com
Punjab Airtel-----------------------MobileNo@airtelmail.com
Pondicherry BPL Mobile------------ MobileNo@bplmobile.com
Tamil Nadu Airtel-------------------MobileNo@airtelmail.com
Tamil Nadu BPL Mobile-------------MobileNo@bplmobile.com
Tamil Nadu Aircel-------------------MobileNo@airsms.com
UP (West) Escotel-------------------MobileNo@escotelmobile.com
Madhya Pradesh Airtel 9893 919893xxxxxx@airtelmail.com
Maharashtra Airtel 9890 919890xxxxxx@airtelmail.com
Maharashtra BPL Mobile 9823 9823xxxxxx@bplmobile.com
Maharashtra Idea Cellular 9822 9822xxxxxx@ideacellular.net
Mumbai Airtel 9892 919892xxxxxx@airtelmail.com
Mumbai BPL Mobile 9821 9821xxxxxx@bplmobile.com
Punjab Airtel 9815 919815xxxxxx@airtelmail.com
Pondicherry BPL Mobile 9843 9843xxxxxx@bplmobile.com
Tamil Nadu Airtel 9894 919894xxxxxx@airtelmail.com
Tamil Nadu BPL Mobile 9843 919843xxxxxx@bplmobile.com
Tamil Nadu Aircel 9842 9842xxxxxx@airsms.com
Uttar Pradesh (West) Escotel 9837 9837xxxxxx@escotelmobile.com
Chennai Hutch 9884 9884012345@south.hutch.co.in
Andhra Pradesh Hutch 9885 9885012345@south.hutch.co.in
Karnataka Hutch 9886 9886012345@south.hutch.co.in
Karnataka Airtel phonenumber@airtelkk.com
BSNL: You can send SMS emails to BSNL phones as mobilenumber@bsnlumN.com. The email domain is different for each region - bsnlumN.com (North), bsnlumS.com (South), bsnlumE.com (East) and bsnlumW.com (West).
