Data. Data.

Boing Boing ran a post at the end of September that I have been meaning to link to here for several weeks now.  According to Cory Doctorow, who wrote the post:

The American Civil Liberties Union has unearthed a Department of Justice document called Retention Periods of Major Cellular Service Providers (PDF), which documents the length of time that America’s mobile operators retain your texts, IP sessions, call details, and copies of your bills.

Here is an excellent summary chart from Wired, which was the underlying source of the Boing Boing post:

How long cell phones hold different kinds of data

Source: Wired.

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