You never know, those Chinese are clever folks, they may have portaled it over there by accident while trying to get Obama's blackberry and when they realized the mistake, sent it back to your home
Apparently, iPhone and iPad constantly tracks the device's movements via GPS and stores all that information on the device, never erasing it.
There is software called "iPhone Tracker" that will let you view the data easily but I think it's only for MAC. But the site explains how you can view the data without installing the software.
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