Here are some details about the newly available GSM phone module for the PCM 2 in USA and Canada:

Option code 666 - Module for Telephone PCM
Price tag is 960 US$ (1340 CND$).
This module includes a hands-free option.

Option code 668 - Handset for Telephone Module
Price tag is 260 US$ (360 CND$).
This is only needed if you want a handset (without dialing capability in the handset itself), for example for confidential calls or if your co-passenger wants to talk on the phone without having to use the standard handsfree option.

Both options are available for immediate ordering!