Why is my data usage suddenly very high? I am not using my iPhone any differently.

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Resident
 
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CPU Alum
CPU Alum
  • Do you have anything running in the background like a Map app?
  • did you receive an email with a large attachment?
  • did you recently update or download an large app?
  • are you watching any video?

Go onto the Telus Mobility site and have a look at your data usage.  It will indicate at WHAT TIME there was any usage spike.  Then look back at how was the phone used at that time window.

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Connector

Check out the site below it might be what's happening to you as well

 

http://www.extremetech.com/mobile/136264-check-your-phone-bill-youre-probably-being-overcharged-for-...