According to Thurrott's WinSuperSite, Windows Phone 7 may be sending large chunks of 3G data behind our backs, data that is not easily explained by any apps and regardless of WiFi availability. This is actually the first we've heard of this issue, but Thurrott claims this is "widely reported" so we're not sure what to make of it.

According to one reader who wrote into WinSuperSite:

I went and looked at my AT&T account online and noticed that my phone was sending huge chunks of data seemingly in patterns. For instance on November 21-24 it sent between 30 and 50 MB of data at 10:41pm each day and Dec 1-4 it sent between 30 and 50 MB of data at 9:41am each day. On December 23rd I turned on airplane mode so my phone could no longer send data. I turned airplane mode off briefly on December 23rd and the phone sent 400 MB of data.

Curious. Personaly speaking, I have a lot of 3rd party apps installed--66 to be exact--and when I just checked my AT&T data usage, I'm below 700MB with 5 days left on my bill-cycle. Translation: I'm certainly not having this problem. Granted, I don't use Facebook nor have my pictures backed up to SkyDrive, so those two may be the culprit. [Update: And yes, I have my "send feedback" enabled for Microsoft, so that's not it either]

But enough jibber-jabbing, any of you experiencing this supposed wide-spread issue or is this just a fluke? Sound off in comments.

Source: WinSuperSite Mailbag

Related: How's your data consumption since going to WP7?