My first was an Ericsson Hotline NMT450. NMT
was the first fully-automatic cellular phone system, used only in Scandinavian countries thus the name of the system Nordisk Mobil Telefoni
(Swedish, in English it means Nordic Mobil Telephony).
Pioneers were Ericsson from Sweden and Nokia from Finland. The first NMT phones had a central unit you had to carry with you, batteries gave power for about 20 minutes phone calls.
I got my first phone in 1987 as a birthday present from my brothers.