Strictly speaking Nokia isn't selling smartphones, HMD is. Nokia itself it primarily an IP company, the Nokia brand being part of that IP. Nokias business-model is about licensing their precious IP to other companies, in this case to HMD.
Not at all. There are more than 100k employees in Nokia as of today.
Nokia is a B2B company that sells most of the backbone equipment for telecom (Those 4/5G stations, every other Service Routers or core routers out there, etc etc ).
The acquisition of Alcatel-Lucent in 2016 helped a lot here.