Google Chat

Gmail chat lets you easily send text messages to and from cell phones. If this feature isn't already enabled on your account, you can enable it by following these steps:

1. Click the gear icon in the upper right, then select Settings.
2. Select the Labs tab.
3. Scroll down until you see Text Messaging (SMS) in Chat, select Enable and Save Changes. You may also enable a supplementary lab called SMS in Chat gadget.

For now, SMS in Chat only works for sending messages to phones in certain countries.

More about Gmail SMS chat:

• Sending SMS from Gmail
• Replying to SMS messages
• Blocking SMS from Gmail
• Commands for SMS in Gmail
• Abuse prevention for SMS in Gmail
• SMS in chat didn't work
• I got an SMS from Gmail, what is it?
• Supported mobile operators
• SMS Quotas in Gmail