Android :: How To Enable Mobile Network?

In my application it is necessary to have internet connection. Therefore i check while starting if a Internet connection is available. If not I ask the user if he would establish an Internet Connection, and what type (wifi oder mobile). The wifi connection i can establish with the following code WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(true); But how do i establish a mobile connection? Couldn't find a single code snippet at Google.