Why iphone uses too much internet?(Wi-Fi)?

It used 140 mb without me using any app or thing that uses internet(i had an app that tells me how much data i uses).
what's is weird is that when i signed out of apple id and restarted iphone 4s, internet usage stopeed.
could someone be spying on me?

Signing out of the Apple ID wouldn't have any effect on your data usage. You could manage it on your own through checking which apps have or not don't have access to use that.

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