If you frequently use up all of your allotted monthly data you can reduce the amount of your phone’s overall data usage by doing one of two things:
1 – Uninstall every app that you never use from your phone. This is extremely effective because it’s impossible for an app to use your phone’s data if it isn’t even installed on the device.
Note: Many pre-installed apps cannot be uninstalled from a device. However, you can disable them which will also prevent them from using any background data.
2 – Change a setting for each app that will prevent it from sending or receiving data in the background.