Cell phone app blocks texting when user is moving at more than 10 miles per hour.

An Orlando, Florida man has invented a BlackBerry app that prevents texting while driving.

George Distler said NOTXT uses the device's GPS to determine when a vehicle is going more than 10 mph.

The app then shuts down all texting and e-mail abilities until the car is stopped.

"Once you stop and the phone receives a signal again, all of your back texts you may have missed while driving will appear normally," said Distler.

Users cannot get around the app without a password.

The app costs $2.99 and is available through BlackBerry's App World.