What's missing in an iPhone? GPS Navigator. It will definitely not appear in the first version. With the second, everything is still vague. Apple are good at making surprises. After June 9th, everything will be known. Let's wait … In the meantime, there are only attempts by enthusiasts to make pseudo gps by calculating the location of the subscriber by cell. A phone operating in the gsm standard can receive information about the location of the nearest cells and the distances to them.
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Further from the geometry course … In general, with a visibility of 3 cells, it is quite possible to find the exact coordinates of the phone. Well, here, of course, there is also an error delta. On average, a discrepancy with the real position of meters is obtained by 200-500. This program has not found practical use for me, the error is too big. A similar service is provided by a telecom operator, but for money.