You can turn off cellular data on an Android device to avoid hitting your data cap when you're not using Wi-Fi.

It’s a good idea to turn off data roaming on your iPhone if you want to avoid using data while traveling internationally.

I'm not always near Wi-Fi, so my mobile hotspot often comes to the rescue. But with limited data to burn, I've picked up a few tricks to stay online without blowing through my monthly cap. Turn Off ...