Sometimes you have the feeling of data goes away too fast than expected without knowing why.
See below for useful tips to prevent unintentional data use.
Tip 3 - Make sure you have turned off automatic backup for Instance Message Apps, such as WhatsApp.
Tip 4 - 'streaming' services such as Netflix, Spotify and YouTube might use large amounts of data. This also applies to video and audio files on Facebook and other social media.
Tip 2 - Make sure you have turned off cloud drive auto-sync, such as iCould,Dropbox, One Drive etc.
Tip 1 - Make sure you have turned off automatic download, such as Apps, Music and software updates.