Short Message Service (SMS) is a communications protocol allowing the interchange of short text messages between mobile telephone devices. The SMS technology has facilitated the development and growth of text messaging. The connection between the phenomenon of text messaging and the underlying technology is so great that in parts of the world the term "SMS" is used colloquially as a synonym for a text message from another person or the act of sending a text message. SMS as used on modern handsets was originally defined as part of the 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 alternative mobile standards 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.

Information from wiki very usefull, it let us know what is sms, everyday we use it. Almost 80% people in the world know what is sms, a sort messege very efficien for communication.

There's a lot GSM provider in all world bring the sms for the content, very cheep, very usefull. In asia, us, uk many provider bring this service for us. Not just GSM technology, the communication still move up, CDMA technology, 3G all so many technology for communicate.

This web to give us link for free sms all over the world, there is absolutly free or pay, just follow all link in this site it will be direct to the website it content sms free. with help of google let's send sms to all over the world free....