This is starting to become popular as a discovery item. I know of only one specifically that records cell phone location - Nextel. BUT there retention is only 72 hours before the data is dumped. Of course that is the Nextel phone that have the GPS walkie talkie feature. I am sure other cell carriers do the same. The data string that is produced is weird not like an address.
EXAMPLE
6/27 0006 7.7 SSW of Atwood TN;17.2 N of ter 32 S
6/26 2306 1.9 ESE of Martin TN;48.8 N of ter
6/26 2206 1.8 ESE of Martin TN;48.7 N of ter 48 N
6/26 2131 0.5 NNW of Milan TN;20.7 N of ter 10 NNW
6/26 2110 3.1 SSE of Milan TN;17.2 N of ter 44 NNE
6/26 2049 4.3 NNW of Jackson TN;5.0 NW of ter 63 ENE
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