How to Send Free Text Messages Online

Since Google removed their SMS function from labs

Carrier Email to SMS gateway

AT&T  [insert 10-digit number] @txt.att.net

T-Mobile  [insert 10-digit number] @tmomail.net

Verizon [insert 10-digit number] @vtext.com

Alltel [insert 10-digit number] @message.alltel.com
Boost Mobile  [insert 10-digit number] @myboostmobile.com
Sprint [insert 10-digit number] @messaging.sprintpcs.com
US Cellular  [insert 10-digit number] @email.uscc.net
Virgin Mobile  [insert 10-digit number] @vmobl.com

http://www.digitaltrends.com/mobile/how-to-send-free-text-messages-online/#!D5zob