I've had various dumbphones over the course of years. A few Xcover line bar phones from Samsung, those were the best, really, but they eventually broke down and were discontinued by that time. A couple of years ago I had Nokia 225 because my smartphone broke, didn't find an appealing replacement, and I'm not that much into smartphones anyway.
I loved the 225 for its simplicity and general responsiveness but texting was abysmally slow after entering a few dozen characters: while the phone was recomputing the text layout on each keypress I could almost see the code as it was written by someone who clearly should've read about computational complexity on compsci 101. That was the sole reason I dumped the phone, especially as SMS is one of the main uses for a dumbphone. Battery was great though, and ringer volumes, speakers and the microphone were good. I suspect the new 3310 is pretty much another revision of that phone.
I would pay decent money for an old skool feature phone that:
- is small enough to fit in a tight pocket without me either feeling it in the first place or bending it broke
- doesn't have its back cover, battery, and phone flying in three directions when I drop it one the floor
- has battery life in weeks
- has a simple but usable camera, 2Mpx is enough for taking photos sharp enough for notes
- has blazing fast user interface with absolutely no delays or lag (how hard can it be?)
- its UI has predictable command paths instead of scrollable list and grid views so that I can punch MENU+5+3+2+1 or something similar to dive directly into one particular submenu. This is how you set your phone to silent/vibrate/loud in the good old times, while walking and never looking at the screen for feedback because you just knew what the phone would do.
- Has 3G/4G data and a basic mostly text-based web browser for checking out timetables, locations or opening times if absolutely necessary
- Has a native online map application: Google Maps for J2ME was, if a bit outdated, still decent
- Bluetooth for transferring contacts, audio files, and photos
All these features have been in phones ten years ago, probably earlier. The best phones at the time had probably 90% of the above list, usually by lacking something that wouldn't have been fixed by technology if only smartphones didn't take over.