Cellular/data usage while connected to Wi-Fi with iPhone 5

[dszlucha]

I recently upgraded from an iPhone 4 to an iPhone 5 and when I view my usage details for data I am seeing small amounts of data use even while my phone is connected to Wi-Fi and charging. I did not see this with my iPhone 4.

The usage is small and I'm guesstimating adds up to 20-30MB per month, but wondering if this is normal.

My iPhone 4 was running iOS 5.1.1 and the iPhone 5 is running iOS 6.0.2 and Verizon 13.3.

I'm not if this is considered normal as I've read about the recent bug that was allowing a lot of data to leak while on Wi-Fi. Supposedly iOS 6.0.2 and Verizon 13.1 fixed this issue. Others have posted that a replacement phone fixed the issue.

The small data use seems to be about 30-90kb every couple of hours. Again, I never saw this with the iPhone 4.

Do others see this small data usage while on Wi-Fi?

Thanks!

David