Supported Carrier List:

If you have one of the carriers listed below and you are getting an error sent back to your phone when trying to opt in, it most likely is that you need to contact your carrier and have your "short code text messaging" enabled.

United States (codes 411247 and 772937):

AT&T Mobility
Boost
Cross
Hawkeye (Chat Mobility)
Hawkeye (NW Missouri)
Metro PCS
Nextel
Panhandle Communications
Pocket -> Now part of Cricket
Revol
RINA
Simmetry (TMP Corporation)
Sprint
T-Mobile
Union Wireless
US Cellular
Verizon Wireless
Virgin Mobile
ACS
Alltel
Appalachian Wireless (EKN)
Bluegrass Cellular
Cellcom
Cellular One of East Central IL (ECIT)
Cellular One of Northeast Pennsylvania (NEPA - South Canaan)
Cellular South
Cincinnati Bell
Coral Wireless (Mobi PCS)
COX
Cricket
Element Mobile (Flat Wireless)
Epic Touch (Elkhart Telephone)
GCI
Golden State Communication
Illinois Valley Cellular (IV Cellular or IVC)
Inland Cellular Communication
Iwireless (Iowa Wireless)
Keystone Wireless (Immix Wireless / PC Man)
Mosaic (Consolidated or CTC Telecom)
Nex-Tech Wireless
NTelos
Pioneer
Plateau (Texas RSA 3 Ltd)
Thumb Cellular
United Wireless
Viaero Wireless
West Central (WCC or 5 Star Wireless)

United States (code 86677):

Alltel
ATT
Boost
Cellcom
Cellular South
Cincinnati Bell
Cricket
MetroPCS
Nextel
nTelos
Sprint
T-Mobile
US Cellular
Verizon
Virgin
All West Wireless
Bluegrass
Cambridge Telecom
ECIT
Appalachian Wireless
Farmer's Mutual Telephone Company
General Communications
Golden State Cellular
Immix
Inland Cellular
Illinois Valley Cellular
Nex-Tech Wireless
Nucla-Naturita Telephone Company
Revol REVOLUS
Silver Star PCS (aka Gold Star)
Snake River PCS (aka Eagle Telephone System, Inc)
South Central
Syringa
Thumb Cellular
UBET Wireless
Unicel (formerly Rural Cellular Corp/RCC)
United Wireless
West Central Wireless

Canada:

SaskTel
Microcell Connexions
NorthernTel Mobility
MTS Communication
Telebec
Aliant Mobility
Telus
Virgin Mobile Canada
Bell Mobility
Rogers