App updates if you have that setting on. Email and other apps synchronizing, otherwise you wouldn’t know you have a new email. For text messaging, if you’re actually using SMS that’s a sideband and doesn’t count towards your data but if you send MMS messages or use a third party text messenger such as Google messages which uses RCS then all or a portion of those go through the data part of your phone especially if you’re sending a text message. Lots of apps work in the background, you can see which apps do by going into your battery settings and see that there’s a setting to reduce background data usage for each app.
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