Mobile phone records can be very useful in defending yourself from something you didn't do. They can be a real pain to get, however, and you can count on having to subpoena them. Following is the contact information for where to send a subpoena for mobile phone records for most of the major mobile carriers and some of the lesser ones, too:

AT&T (Cingular):

Custodian of Records
AT&T Subpoena Compliance
P.O. Box 24679
West Palm Beach, FL 33416
Fax (888) 938-4715
Voice (800) 635-6840

Sprint (including Boost and Nextel):

Custodian of Records
Sprint Corporate Security
6480 Sprint Parkway
Overland Park, KS 66251
Fax (913) 315-0736 or (913) 315-0735 (816) 600-3111
Voice (800) 877-7330

T-Mobile records (including Aerial and VoiceStream):

Custodian of Records
T-Mobile Subpoena Compliance
4 Sylvan Way
Parsippany NJ 07054
(f) 973.292.8697
973.292.8911

Verizon:

Custodian of Records
Verizon Cellco Partnership, d/b/a Verizon Wireless
Subpoena Compliance
180 Washington Valley Road
Bedminster, NJ 07921
Fax (888) 667-0028
Voice (800) 451-5242

Metro PCS:

Cricket: