Ok, again looks there is a confusion or i am not able to explain ..

I have a Phone Kit already built in in my car, The phone using GSM networks and it require a SIM card to be insterted in the BASE unit in the car under the arm rest console, BMW provided the car with a Wireless Handset in case you dont need to use the CAR KIT Loudly, or move around the car and talk using the WIRELESS handset, The SIM card inserted in the Base Unit in the car not into the wireless handset.

The Car kit working perfectly now but without the handset, what i need is to configure the REPLACEMENT handset that i bought to my Original Car kit. There is nothing to do here with Analoge or digital or even the carrier, the new handset keep showing a message "Searching for Base Unit" because its already taken from a different car so it needs to be configuerd with My Car Wireless Frequency.

Hope i managed to explain

Cheers!