fwiw, I tried this on a symbian60 phone... have it ring an alarm "wake up
and get off the bus" when I approached a certain tower. The problem is that
alarm went off at the most unexpected times. I think cell tower reception
isn't just nice little circles like you'd expect.
You don't need GPS for that. It's a quite simple Python script (without
GUI certainly less than 10 lines) for PyS60 (Symbian S60), that checks
the GSM/UMTS cell info, and sends a SMS to your wife if you enter a
specific cell ("I'll be home in 15 minutes" or "I'm near to the
supermarket, should I pick up anything?" come to mind).
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