If the automatic update feature is enabled, your applications get updated without you being asked, so you may not realize that large volumes of data are being downloaded. In order to avoid potentially high data transfer costs, you can disable automatic updates or enable automatic updates only over Wi-Fi connection. You have to disable the automatic update feature in the Play Store app to avoid the automatic updating of applications.
Find and tap (Play Store icon).
Tap the account icon, and then find and tap the auto update apps menu in the settings menu.
Select the preferred option.