Archived from groups: alt.cellular.verizon (More info?
The Nokia 6015i accepts either the "normal" ("non-Nokia") 2.5 mm headsets,
which plug into the side, or the Nokia brand proprietary headsets (ones that
are for 6015i's), that plug into the bottom multi terminal port.
The older "nokia Only" 2.5mm headsets were for some older Nokia models, &
are Not compatible with the newer Nokias, which now use the "regular" standard