How can I disable the mobile data connection of my BlackBerry Passport? The procedure is quite simple:
Swipe down from the top of your screen to open the quick menu.
Tap on Settings
Go to Network and Connections > Mobile Network.
Toggle the switch next to Data Services to Off
NB: The Data services while roaming menu (default value: prompt) allows you to configure how your phone will connect to mobile data when you are travelling outside the range covered by your local mobile operator. You can also turn off this feature permanently if you want to.