cellity.com - Call first class and pay economy Feature set includes Worldwide low-cost communication, cellity works in any country, with any phone, with any SIM-Card.You simply need to install the free application by cellity to start sending free sms.
Gcalender - Google calender ,it could be a complex way to send a sms but quite good as if now it supports almost all the mobile subscribers. But before you can send a sms to mobile number you need to setup your mobile number.
Vakow- Also check out Vakow! (http://www.vakow.com). It’s a community of people who love SMS Forwards. You can post your SMSes and find new ones to share on phone, email or Orkut.
Way2SMS.com offers an unlimited messaging platform where millions of SMSes exchanged each day
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SMS Dailies is a free* SMS subscription service for mobile users in India, offering daily messages on a wide range of topics. It has already become a defining feature in people's lives - offering news, information, advice and fun.
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YouMint pays you to invite friends and to receive SMS promos! It might just pay your Mobile bill :-)
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Any Mobile or landline subscriber who does not wish to receive telemarketing calls, can request their telephone number be included in the NDNC Registry. Such request are sent through their telecom service providers which will be stored in National Do Not Call Registry, which is expected to be established from Sept. 2007. Subscribers can make a Do Not Call requests via Letter, phone, SMS or on-line.
IDEA subscribers can fill an online form here.