http://www.verizonwireless.com
2. AT&T
http://www.att.com
3. T-Mobile
http://www.tmobile.com
4. Virgin Mobile
http://www.virginmobile.com
5. Sky Tel
http://www.skytel.com
6. ALLTELL
http://www.alltel.com
7. Sprint PCS
http://www.sprintpcs.com
8. Nextel
http://www.nextel.com
9. Cellular One
http://www.cellularone.com
10. NTT DoCoMo
http://www.nttdocomo.com