You need to send the NDISDUP command to your modem.
echo 'AT^NDISDUP= 1,1,"<APN>"' > /dev/cuaU0
Of course, you must replace <APN> by the APN of your ISP.
Many thanks!
echo 'AT^NDISDUP= 1,1,"internet"' > /dev/cuaU0
did the trick for me.
Is this something I need to do everytime I insert the modem and how would I automate it?
Also how do accommodate routing to this ISP?