Short Message Service (SMS) is the text communication service component of mobile communication systems, using standardized communications protocols that allow the exchange of short text messages between mobile phone devices. SMS text messaging is the most widely used data application in the world, with 2.4 billion active users, or 74% of all mobile phone subscribers. The term SMS is used as a synonym for all types of short text messaging, as well as the user activity itself, in many parts of the world. 
SMS as used on modern handsets was originally defined as part of the Global System for Mobile Communications (GSM) series of standards in 1985 as a means of sending messages of up to 160 characters, to and from GSM mobile handsets. Since then, support for the service has expanded to include other mobile technologies such as ANSI CDMA networks and Digital AMPS, as well as satellite and landline networks. Most SMS messages are mobile-to-mobile text messages, though the standard supports other types of broadcast messaging as well.
160by2.com
160by2 (a SMSCountry initiative) endeavors to revolutionize the very concept of sending SMS - from a PAID service to a FREE service. You can now send free SMS messages, 80 characters long, within India to all your near and dear.
Way2sms.com
SMS communication totally cost free to mobile users, at the same time, enables advertisers to reach out to millions of mobile users through the revolutionary concept of 'Mobitisement' (advertisement on mobile phone).
This pioneering effort has already captured the imagination of millions of mobile users across the globe. More than four lakh users visit Way2SMS every day, and they are just not from India alone, but come from as many as 126 countries globally!
Mobile users can register at absolutely no cost with Way2SMS.com, and start sending out text messages to their near and dear ones across the country. Receivers of the messages need not be registered Way2SMS users.
Spicesms.com
SpiceSMS.com is one of the first websites to offer free SMS service. We started in 2004 under the iMobile banner & have entered into the 5th year of providing free SMS to India. Our website & back-end were recently revamped providing better services than ever.
Yourmint.com
YouMint.com is owned by MobileTree Ltd, a company registered in England. MobileTree’s parent company is a London based holding company for 3 telecom related businesses and works closely with over 400 mobile operators globally i.e more than 60% of all mobile operators in the world!
Indyarocks.com
Indyarocks.com is an online and mobile social entertainment platform for Indians across the Globe. It allows members to build and leverage their network of contacts and share games, bollywood content, music, photos, videos and blogs in many incredibly powerful ways. The platform is designed to provide you with unlimited freedom of expression. Plus, you can invite your non-Indian friends too to experience the rich Indian culture through Indyarocks.com
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