Why does my blackberry automatically connect to the internet at weekly intervals for 5-6 hours?

-I received a bill from Vodafone for charges for internet usage in Spain when the phone is switched off and I'm asleep - the connections lasted for 5-6 hoursYou might have BlackBerry Protect's 'backup while roaming' turned on or some other apps that use the internet on a regular basis. Check each app's settings.
you may have downlaoded an app called blackberry protect, everyweek it syncs your contact and messages in an online cloud so if you loose your device you can sync back all contact information to a new blackberry