how to convert an old MOTOROLA car phone?

[TonyA1]

I have an old motorola car phone, complete with everything needed, circa 1980's, (in my classic car) and would like to convert / adapt it for use on today's networks.
I understand it was Analogue, and today's stuff is Digital, but would it be possible to connect it to a modern mobile via its coiled cable?

 

[SaltUK]

Naw - but they fetch good prices on ebay for some reason!

 

[classicsat]

Easiest way is to figure how the handset works. It is basically a keypad with send data from the keys and hook sensor, a display, and send and receive audio.

With that, you need to re-build the radio unit, with a GSM board, or even a phone you can control over its serial port. You have a microcontroller interface between the handset and phone for control, and you connect handset audio to the phone/module audio.