I want my phone (running Android 2.3.5) to only connect to the Internet via Wi-Fi.
How can I disable all non-Wi-Fi connections, such as 3G or similar?
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You can go on the configurations and disable the usage of mobile networks manually. If you want a more handy tool (i.e. not need to open menus), looks like this app can do it: APN Switch
APN-Switch is a simple widget that allows you to quickly enable (or disable) your data connection (3G/EDGE/GPRS) with a single click.