With this nifty map from MIT researchers, using anonymous AT&T data, a user can trace where most outgoing calls from mobile phone in a given county go.
In Philadelphia’s case, depicted above, or available by searching for it on the site, it’s very regional, with New England, Florida and Southern California showing up.
Also check out this regionally based map using cell phone data, showing a big divide between Philly and Pittsburgh.
H/T Patrick Kerkstra
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MIT
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