Unlimited Data plan occuring tethering cost with Internet Sharing off

[Ross Mullin]

My operator O2 Ireland said there is an issue with the Lumia 920 not supporting unlimited data plans as it randomly creates an open.internet connection, I have been trying to understand why my account as data costs sometimes for downloading. Does anyone know the fix for this? Currently for GDR1 with the PR1.1 Firmware

 

[brucexli]

It probably is due to some misbehaving app

 

[Ross Mullin]

Was thinking that myself, but how do I find out which app. My operator are convinced it is related to unlimited plan