When was caller id first available in Argentina?

Question

I am a marketing student. I am studying telephone compainies in Argentina and the variety of services provided after privatizacion . But I couldn't find year in which the service of identification of caller's phone number in land phones (not cellphones) became available for first time. Anyone remembers? thanks.

carola

Answer 1

Telecom, 1990-1991?

this is a useful site:

http://www1.uni-hamburg.de/IIK/nikt/koop...