I've now turned off the mobile internet in the settings to prevent a huge bill!
I don't understand this as its my work phone, so only use if for incoming emails really,and I'm always connected via WIFI at work and at home, so it seems to me that when the phone locks the WIFI automatically switches off and then runs on mobile data.
There are no settings to rectify this either.
Please check your allowances as this has used 487mb in 12 days!!!!!!
P.S After looking online it appears that either there is a bug or it's just the phone, but it disconnects the Wifi to save battery, meaning that it will run off mobile data occurring huge data consumption!!
Any one else noticed this, as some of my colleagues have this phone and the are on Orange and haven't noticed massive allowances.