Looking back, I can't emphasize how much I loved the 3310 UI. Clean, fast, no colors, simply perfect. I'm currently using a Nokia 2600 Classic [1] with Symbian; it feels incredibly slow and cumbersome as compared to the 3310. Literally having to watch a progress bar while the phone's calculator(!) is loading.
But, that darned 2600 also refuses do die (it was already showing dead pixels, so there was some hope in the meanwhile), so I estimate being stuck with this one in the years to come also.
Another fun UI was from a Big Button Phone For Elderly People that belonged to my grandpa. I think it's a ZTE s202 [2]. Unfortunately, the microphone gave up working, so I ditched it.
That world of Old Dumb Phones is actually a lot of fun. And -- it's odd to think how much outdated-but-entirely-usable electronic waste there actually is on the planet.
Thanks, Finns, for enriching the world with the rock-solid 3310, and greetings from the other side of the gulf!
1: https://en.wikipedia.org/wiki/Nokia_2600_classic
2: https://i.hinnavaatlus.ee/p/1200/99/43/S20220must__6ee8.jpg
There's no Symbian on that phone. Symbian was pretty much a smartphone OS that didn't really show up on feature phones. It had a full-blown WebKit browser, native apps, multitasking, productivity suites... you could even install Python interpreter and play with writing apps this way on Symbian phones from around that time (which is what I kept borrowing my mom's E65 for). Later versions even had Qt built-in.
Nokia 2600 Classic used one of the iterations of Series 40. Looking at the videos, it indeed appears rather slow on this phone.
At least in Finland just having the more expensive phones was seen as a status symbol and usually people were using them for calling, smses and perhaps for emails.
That said, S40 was being used on feature phones for more than a decade (from Nokia 7110 in 1999 up to Nokia 515 from 2013), so it spanned across multiple UI generations and while it was very successful initially, at the end of its lifespan it didn't do particularly well when put on models with big touchscreens.