Turn On / off 3G Data

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ConnectivityManager mgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); Method dataMtd = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class); dataMtd.setAccessible(true); dataMtd.invoke(mgr, true/false); you need android.permission.CHANGE_NETWORK_STATE permission too share|improve this answer answered Dec 2 '11 at 11:56 Riyaz Mohammed Ibrahim 1,14941422

Hi, Thanks. The only issue is that it cannot stably enable data connection in my HTC EVO 4G -- although the widget seems enabled but it is not really data connected. (Disabling data connection is always okay) – Richard Ye Dec 5 '11 at 7:03 feedback

up vote2down vote	You also need to add <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /> to the manifest.xml share|improve this answer edited Oct 2 at 9:43 Jav_Rock 8,67373369 answered Oct 1 at 20:31 Martin 212
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In your androidmanifest.xml: <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />