iPhone 11 Cellular Data display

[Ge0rge2021]

Guess I osted this in wrong forum sorry. Just upgraded to a iphone 11 from a 7 and noticed on the cellular data usage for current period shows 11.8 gb but my billing page from provider shows 795mb what does current period mean I just have the phone for one week.. Also could someone tell me if I should leave cellur data on?
Thanks

 

[now i see it]

Reset the cellular data usage at the bottom of the page. The counter will reset. When I set up a new phone from a backup, my cellular data stats were wonky too. Just reset it.
It depends on what service plan you’ve got and what you do away from Wi-Fi that will determine what you should do about using cellular data.
If you don’t stream video or watch much YouTube, typical cellular data usage can be under 2 GB /month