Below are some photos of the restoration of my old Nokia 9000il. The Nokia 9000 series is generally believed to be the first "smart phone" on the market. I was able to find the PAR-1 adapter on eBay, however I had to rebuild the battery as the original would no longer hold a charge and I was unable to find a working one online. I also had to make a serial cable as none were available online. Thankfully, there are a lot of good pages of information online about these devices so I was able to do both. I will also include some links if anyone else is working with one of these.
https://www.mgroeber.de/nokia.html
https://web.archive.org/web/20020210063855/http://www.yaws.dk/communicator/faq/landline/home.html
https://www.manualslib.com/manual/830641/Nokia-9000i.html?page=332#manual
http://agustafsson.atspace.com/dlr1.html
https://github.com/mgroeber9110/nokia9000-apps/tree/main
https://bluewaysw.github.io/pcgeos/Devices/Nokia9000/ngrabbag.html