We use SMS short code messaging (the most reliable messaging protocol available) and support the following mobile carriers: 

• AT&T
• Verizon Wireless
• T-Mobile
• Sprint/Nextel
• Alltel
• Boost
• U.S. Cellular
• Cricket
• Virgin Mobile
• Centennial
• Cellular South
• nTelos
• Cincinnati Bell
• Iowa Wireless
• Cellcom
• Revol Wireless
• Dobson
• Bluegrass Cellular
• Immix Wireless
• Airadigm
• ACS Alaska US
• Rural Cellular Corporation (Unicel)
• Eastern Kentucky Network
• Midwest Wireless
• ACS Alaska
• Nex-Tech
• Appalachian Wireless