Please enter your phone number in Phone Number + SMS Gateway format.

Mobile Carrier SMS Gateway Domain
Alltel sms.alltelwireless.com
AT&T txt.att.net
Boost Mobile sms.myboostmobile.com
Republic Wireless text.republicwireless.com
Sprint messaging.sprintpcs.com
T-Mobile tmomail.net
U.S. Cellular email.uscc.net
Verizon Wireless vtext.com
Virgin Mobile vmobl.com

For Example:
PhoneNumber@SMSGatewayDomain
1112223333@vtext.com