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.
<br><br><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>You don't need GPS for that. It's a quite simple Python script (without
<br>GUI certainly less than 10 lines) for PyS60 (Symbian S60), that checks<br>the GSM/UMTS cell info, and sends a SMS to your wife if you enter a<br>specific cell ("I'll be home in 15 minutes" or "I'm near to the
<br>supermarket, should I pick up anything?" come to mind).</blockquote></div><br>