Here is a complete list of mobile phone carriers in the United States that are currently participating on mobile marketing site 84444.com.

Tier 1 Mobile Operators

AT&T
Sprint
Nextel
T-Mobile USA
Verizon
Alltel

Tier 2 Mobile Operators

Boost
Cricket Communications
Metro PCS
US Cellular
Virgin Mobile USA

Tier 3 Mobile Operators

Cellular One
Cellular South
Cincinnati Bell
nTelos

If you are seeking a carrier that is not listed here, please contact us as new carriers are being added all the time.