I want to avoid accidental roaming charges on my Nexus 7 3G model with a limited 3G data plan, so I always have to disable all wireless features and even power down the tablet. But sometime I need to browse internet and read email. Is there a solution without data roaming charges for Android users?
How to Turn off 3G and still use wifi only on Nexus 7
* From start screen, tap on your Settings app that looks like a gear.
* Tap on More > Mobile Networks, uncheck "Data Enabled." to turn off just your 3G radio. Then you can connect to a Wi-Fi enabled router or hotspot and you should see only a Wi-Fi signal icon on screen.
Obviously, some apps also promise to do the same thing, such as Power Toggles which is excellent toggle bar widget, and other widgets that purport to uncheck it as well.