Sprint sells phones that have built-in GPS. But Sprint doesn't think you should be able to use the GPS. At least, not unless it's in the exact way they want, and in a way that makes them more money.

A mobile Java app called Mobile GMaps connects the built-in (or Bluetooth) GPS and Google Maps to show you where you are on a map. Simple, and thanks to the somewhat-standardized environment of Java, it doesn't require Sprint's explicit okay.

Too bad Sprint, like all U.S. wireless carriers, doesn't like users doing things without their explicit permission - because if they don't have to give permission, they can't withhold it to make app developers pay them. So Sprint has threatened the Mobile GMaps developers with a lawsuit unless they make it harder for users to use the GPS.

Sadly, wireless carriers are consistently placing themselves as gatekeepers standing in the way of mobile innovation.