Wi-Fi savings

It's all too easy to run up costs when you're on public or mobile WiFi.Tethering a tablet to a phone can suck a surprising amount of data and public WiFi such as that found in hotels, Sometimes have ridiculously strict usage policies. In Jelly Bean's Data usage settings you'll find the option to designate certain WiFi networks as Mobile hotpots which stops background apps accessing data and could save you lots of cash. If there's another Jelly Bean device on the same network it'll pick up its Mobile Hotpots Settings too.