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I have written a little Java app for mobile phones with GPS that will calculate the Maidenhead Locator Grid that you are in.
This system of identifying location is used in Amateur Radio, as it cuts down on the number of characters used to encode the information, something very useful when using Morse Code.

Now that I've started writing little apps for phones, I occasionally get excited by one, and send a link to some people.

They get an SMS from me with an URL ending .jad, and a message urging them to install, and run it.

Some do, some don't - I suspect because they're suspicious about it.
Hell, if I didn't know about phones, and permissions, I wouldn't. No way. I'm far too suspicious when it comes to things like that.