APN-Switch
Small APN on/off widget - uses code from APNdroid (ApnDao) which is (also) licensed under the GPLv3.
APN on-off Widget
“APN OnOff Widget is a beautifully designed and easy-to-use widget. It allows you quickly enable or disable your 3G/EDGE/GPRS ...
APNdroid
Toggle that prevents your phone from connecting to internet over 3G/EDGE/GPRS. This application modifies APN names and types b ...
APN OnOff
“Switcher for toggling mobile Internet connection”