Hi guys, I recently bought an '01 Volvo s80 and I'm dying to try out the phone system. I use a Telecom NZ simcard and it picks it up, can display previous text messages received on my mobile but doesn't let me make a call or ring it

is there something in the settings I have to do in order for it to work? Or is it my simcard (if so why is it still displaying previous text messages?)

Any advice greatly appreciated
Thanks in advance!