If you’ve noticed your monthly data plan has been running out sooner than usual and you’re not sure why, then you can check your roaming data and statistics on iOS.  You’ll find Current Period and Current Roaming Period statistics on the Mobile Service page of your iPhone or iPad’s Settings.  Current Period refers to the amount of data you’ve used since your last reset or billing cycle. Current Roaming Period refers to the data you have used while roaming
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