To disable the mobile data connection your BlackBerry Passport, you will need to follow the following steps. Swipe down from the top of your screen to open the quick menu and tap on Settings. Then, go to Network and Connections > Mobile Network. Toggle the switch next to Data Services to Off and your noble data will be deactivated.
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.