Let your car kit use your device's network credentials
Your car kit must support the remote SIM Access Profile (rSAP).
Turn on rSAP to allow your car kit to access the SIM card in your BlackBerry device. When your car kit has access to your
SIM card, you can use your car kit to make and receive phone calls, and send and receive text messages (SMS and MMS).
On the home screen, swipe down from the top of the screen.
Settings > Networks and Connections > Bluetooth >
Turn on the rSAP Mode switch.