To send a text message to another H2O® Wireless customer from email, place your friend's 10-digit H2O® Wireless phone number followed by @txt.att.net in the "To" or address field. 

For Example: If your wireless number is (555) 123-4567, your e-mail address is 5551234567@txt.att.net. 

To send text messages from your email to friends who have service with other carriers, you would typically enter the email address as the 10 digit phone number of the person you want to send a message to, followed by the carrier's address. 

If they reply, their message will go straight to your email inbox.