Go to Settings, and under Wireless & Networks, tap on Data usage or Mobile data (you might need to look around on different Android phones, but it should still be under your .
There is a cardinal rule for saving cellular data: If there’s Wi-Fi, use it.
Chances are at both home and work you’ll have some type of Wi-Fi access to connect to, and even in many public places — including parks, supermarkets, even department stores — public Wi-Fi is there for your use.
My Data Manager keeps track of your usage and even allows you to set custom alarms when you exceed a certain amount of data in a month.
On Android 4.0 or later, you can check your data usage just like i OS, but also set alerts and limits.
So how exactly can you reduce your data usage on the road?