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

SMS through Google Chat in GMail was discontinued - Chat Help

I am going to miss this Google functionality... 

SMS through Google Chat in GMail was discontinued

As of April 1, 2014, sending SMS messages to phone contacts through Google Chat in Gmail was discontinued for all supported mobile operators. All existing users can opt in to Hangouts and select to receive messages in SMS settings

https://support.google.com/chat/answer/112176?hl=en&rd=1