ChristianR

iPhone SDK and Restrictions: Some of the Details Aren’t Great

"I don't know anyone who would want such a feature, or a developer stupid enough to contemplate it for the mass market."

Lots of people. Disney Mobile has such a feature on their phones that allows tracking and they seem to have a mass market for kids phones and parents who want it. There are a lot of other opportunities here too.

A small background application (you are talking less than 1k of code) would handle a lot of the hard work and use very little battery life.