I have very big mobile phone

In my closet I found very old mobile phone. It is Motorola Associate 2000.

The power supply and antenna is lost. But the most interesting part, that the phone is still working. Of course I can’t make calls, but I can hear busy tone or after pressing few buttons I hear “This service is not available for you”. It is funny, as officially NMT-450 phone system is not working for about 10 years. As I know, the system is used in local Telecome for giving phone numbers where copper wires are too expensive- in distant villages or in places where all copper pairs are already used.