Which US Telecoms Store Customer Data the Longest?

Wired Magazine has gotten its hands on a US Department of Justice memo which summarizes the retention policies of the major US telco companies:

Which Telecoms Store Your Data the Longest? Secret Memo Tells All | Threat Level | Wired.com:

The single-page Department of Justice document, “Retention Periods of Major Cellular Service Providers,” (.pdf) is a guide for law enforcement agencies looking to get information — like customer IP addresses, call logs, text messages and web surfing habits – out of U.S. telecom companies, including AT&T, Sprint, T-Mobile and Verizon.