A new app hit the iTunes store Friday morning that your carrier probably isn't too thrilled about.

It's called CarrierCompare. Developed by Boston-based startup SwayMarkets, it allows you to see which carrier offers the best service for your iPhone in any given location.

The crowd-sourced app is simple to use. After you touch the start screen, the app takes about 15 seconds to analyze your network for signal strength, response time and speed. It then compares your result with other nearby results on the other two national carriers' networks.

The display is intuitive, telling you where your carrier ranks compared to the competition.