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Re: sync email (lumia 920) prefers datatransfer vi...

New Member
Posts: 1

sync email (lumia 920) prefers datatransfer via provider in stead of wifi

Hi all,


I'm the proud owner of a (sim lock free: so no provider issued software) Lumia 920, and got a bit of a shock receiving my latest provider bill. I'm supposed to have used about 20 MB data using cellular data connection (from here on CDC)! Since I don't have an internet deal with my cellular provider, this has been a bit of an expensive surprise.


I've set my lumia to NOT use CDC and set wi-fi ON, and I know for sure not to have have used internet out of range of a wi-fi connection. So where does the 20 MB come from?

I know now, but I'm not sure why:

e-mail sync uses CDC, not wi-fi, even though says it'll prefer wifi over CDC. Then why is it ignoring my settings?


Browsing through all setting options I decided to turn my cell to 2G. Know what? I couldn't sync email (hotmail, exchange, etc) at all anymore! The error I received said that I didn't have CDC (I told my phone that I knew that because I turned CDC off... no response :smileysad:)


Solution to that was to disable wi-fi, go back to start and go back and enable wi-fi.


But the question remains: why does the lumia 920 use or prefer cdc over wi-fi for syncing emeails, even though I've turned cdc off???



Please use plain text.
Mobile Guru
Posts: 4,204

Re: sync email (lumia 920) prefers datatransfer via provider in stead of wifi


It does not prefer Cellular data over Wi-Fi, but will disconnect from Wi-Fi when under lockscreen and not connected to a charger. This is well documented behaviour.


The Portico update currently rolling out for WP8 devices will have an option to keep Wi-Fi on when under lockscreen which should resolve your issue..


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Please use plain text.