Android App "3G Watchdog" and "Speedtest"

How to automatically disable 3G Data when close to exceeding data bundle - 3G Watchdog - Android App

Setting up 3G Watchdog Pro

Datally by Google: Control and Save Mobile Data, Wifi

Apps that monitor data usage free on Android; and an iOS cloud app to squeeze data and bill

Just Show Me: Apps to check your data usage on your Android phone

App Android - Guida all'uso di 3G Watchdog

3g Watchdog for Android Review (Bandwidth Meter) (Droid X, 2, Pro, Evo, Incredible, Fascinate, G2)8