Possible WP7 bug using 3G data unnecessarily

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Users have complained of a very serious bug in Windows Phone 7, in which the phone uses its 3G connection even when connected to Wi-Fi.

Julie G, writing to the SuperSite for Windows mailbag, says:

I got my Windows Phone 7 the day it came out, and as of yesterday I completed my first full month of service. With this phone I do not stream, I hardly surf the internet, I mostly have the location services turned off. I do have Facebook connected with Windows Live so I do get the updates on the people hub and pictures hub and I do play Bejeweled quite a lot as I am addicted. I do have my Yahoo mail and Outlook mail synced to the phone. Beyond those few things, I do not do much else with the phone.

On December 22nd I received an email from AT&T saying that I was close to my 2GB data limit which truly shocked me as I feel I do not use data that much. 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. I called AT&T yesterday, December 28th, but they said that there was nothing that they can do to figure out what was happening on my phone.

According to Paul Thurrott of SuperSite for Windows, this is a widely reported problem. Have any of our users been affected by this bug? Has anyone managed to track down a potential cause?

More about the topics: bug, wifi, windows phone 7