I have one Nokia 9110 in regular use, for 2-factor-authentification and for faxing.
Then there is a backup 9110 (fully functional) in my stash and a defective one (possibly for parts, just in case).
The Nokia 9110 uses a 486, has 8MB RAM and the OS is GEOS.
It is (to my knowledge) the only cellphone that can not only send, but receive faxes, too.
Which makes it unique, as the successor models were not able to receive fax.
I also have a 9210, which I do no longer use. It runs even DOOM!
So, am I a phone collector?
(By the way, I do not do anything privacy-relevant with my modern smartphone, as since Merkel opened borders, my city is crowded with "refugees" (almost 5% of the city population) and crime rates have soared more than tenfold. Phone snagging, which was extremely rare before, has become a daily normality here. So one must be careful what he keeps on his phone, just to avoid complications in case of phone theft)