Should Iphone 4s use data when i'm not using it?

Ok so i have an iphone with att… I usually turn off the data to not use up data… But i was wondering… What if i keep the data on, should data be used for any reason?

p.s. I have no email accounts turned on (no email accounts registered at all), notification are only on for phone, messages and calendar, location services are on for camera, maps… All my fetch data is done manually Thanks!

Then you have no problem to turn on the data!
so if you want to do something online the phone is always ready and connected
and don't worry about the bill, because as long as you don't have any emails or any thing the might use data or needs it, then you are safe
but there's always something that uses data, so make sure there on apps opened that user data, and believe me when I say:

\\\\iphone is filled with apps that needs to fed data!

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