I have seen many people looking for contact information for a specific carrier.. Therefore I present this as a useful guide to find the information... Also, I have listed very informative FAQ's on each carrier...
CONTACT INFORMATION
For Sprint Contact information, go
here
For AT&T Contact information, go
here
For Verizon Contact information, go
here
For T-Mobile Contact information, go
here
For Alltel Contact information, go
here
CARRIER LINK'S
SPRINT LINKS
AT&T LINKS
VERIZON LINKS
T-MOBILE LINKS
CARRIER FAQ'S
SPRINT FAQ
AT&T FAQ
VERIZON FAQ
T-MOBILE FAQ