APNdroid - Free APN data access toggle for Android

Here’s a free Android app that can save your bucks or battery life in case you need to turn off your data access while allowing calls when you're travelling/asleep/etc. With this APNdroid app you can enables/disable APNs to connect to internet on Android OS.

Description from Android Market:

Toggle that prevents your phone from connecting to internet over 3G/EDGE/GPRS. This application modifies APN names and types by adding 'apndroid' suffix to them (you can edit them anytime in your phone's Settings). NOTE: Uninstall with enabled internet access! Otherwise you'll be offline, needing to change APNs manually.