In-dash Navigation

So I was thinking about replacing my stock XM radio with a nice touchscreen one with XM capability. I know I need a harness if I use Onstar currently, but with the correct harness, (and if you could please tell me which one that is) is Onstar actually usable for calls and such? And will the XM antenna that's factory installed be usable with an aftermarket radio. Thanks in advance for any guidance! :D

I think the harness for that one is the GMOS-LAN-01 harness. Says its for 09+ aveo and retains all onstar features as well as warning chimes. Expensive at $90+ but does the job and the factory Xm might be able to be reused ull just have to find out by removing the radio. The aftermarket radio will need the XM tuner anyways which comes with a satellite antenna.