An SMS (short messaging service) email extension is a line of text that you must add to the ending of a cell-phone owner's number if you want to send him a text message via email. There are four major cell-phone providers in the United States, and all of them have a unique code that allows you to address short messages to their various cell-phone customers. Keep in mind when sending your emails that you should keep your message very short.
The email extension for Verizon Wireless users is "@vtext.com"—add this extension after the full cell-phone number. When you send a text message to a Verizon customer you have a 160-character limit per text—any email you send longer than that will separate into two or more messages.
You can reach an AT&T Wireless cell-phone account holder by emailing the phone number followed by "txt.att.net." Like Verizon, AT&T also has a 160 character limit on each text message. Keep in mind that AT&T Wireless now includes former customers from Alltel and Cingular.
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Sprint, which merged with Nextel in 2005, has two different extensions for subscribers. Before you attempt to send your message, find out if the person you want to text is a former Nextel customer first. Use "@messaging.sprintpcs.com" to send a text message via email to a Sprint user and "@messaging.nextel.com" if it's a former Nextel customer. In either case, the message size limit is 500 characters for Sprint (and Nextel) users.
T-Mobile, another popular mobile service, also allows you to send short messages via email. If you need to send your text message via T-Mobile, type "@tmomail.net" after the full cell-phone number. T-Mobile permits 160 characters per text.