If you have multiple phone lines, or if your work phone is
associated with your BlackBerry device using the BlackBerry MVS Client, you can make calls with the phone line you want using the
Priority Calling feature. With Priority Calling, you can assign a phone line or app to
use when you make calls.
In the Phone app, swipe down
from the top of the screen.
Tap > Priority Calling.
Set the Use Priority
Calling switch to On.
To choose your phone line when you make a call, on the Calls screen, tap the
Select Line drop-down list. To use a specific phone line, tap
a phone line. To automatically use your mobile line when you're connected to a mobile
network, tap Use the Priority Line.