Hm, for a site specialized in Nokia phones, it sure has a lot of "unknown models". I assume those are design mockups or prototypes of phones that didn't make it to mass production? At least this N-Gage lookalike https://repo.aalto.fi/uncategorized/IO_e3183882-13b3-48a0-a5... clearly has a dummy screen...
I visited a lunch spot popular with Nokia R&D employees. It was extremely common for people to have a prototype phone in a fabric bag at the lunch table, so you couldn't see what they were putting to the test of daily use. Lots of very funky phones were glimpsed, only few of them later became commercial products with definite model numbers.
It's an internal Nokia design archive: https://news.ycombinator.com/item?id=42723034 So there are a lot of internal designs and prototypes