To ensure you get the best out of your bundle plan, you can turn on "battery saver" mode. This will make sure you are getting the most potential out of your data plan.
To do this, here is a step-by-step walkthrough on enabling battery saving on iOS and Android.
iOS
1. Go into Settings.
2. Scroll down until you see the option "Battery" > Click into it.
3. Enable the option "Lower Power Mode"
You are now using less battery when roaming.
Android
1. Go into Settings.
2. Scroll down until you see the option "Battery" > Click into it.
3. Click on "Optimise 6 items to save battery"
4. Select that you want to "Optimise manually"
5. Select that you want to turn on Battery saver > Click into "Settings"
6. Enable "Battery saver"