My ancient Samsung Flip Phone X495 still works, got it in 2004. Use it on a pay-as-you-go plan on T-Mobile.
But I will need to replace it in the next few months. The battery is not holding a charge as well as it used to. And..... the replacement batteries are no longer made. Gone, nobody has any. On this phone, the battery is about 3/4 of the rear lower case of the phone itself, snaps in place and built specifically for this model of phone. So it's not practical to replace the LiPo inside of it.
June of 2015, I had won enough points at Dave & Buster's to get an iPod Touch. I use it for a lot of things, even the timer so when I put something into the oven to bake, it reminds me to go take it out. Also as an alarm clock. And so much other stuff.
I've found the camera to be useful for all those times I wished I'd had some simple camera with me to document something, even an item in a store that I wanted to take a photo of to google later (to find out more info or look for a better price). I still prefer my Canon camera for "real" photos. But as the saying goes, the best camera in the world is the ONE YOU HAVE at the time you need one.
Also, I do use some apps from Michaels and Hobby Lobby to be able to bring up 40% off coupons or other specials that are such a PITA (and wasteful) to print in advance on paper.
When I got into riding a bike as an adult 2 years ago, I found a great biking App, Cyclemeter. But the iPod Touch does not have a GPS receiver in it, so that app would not work. So, I got a USED iPhone 4 to load that app into, and have used that for my biking. As well as an app called iArrow, which is a simple compass with distance and bearing to a GPS spot. Every time I do a ride away from the home area, I set it for where my car is parked so it will help me navigate back if I get lost.
I don't mention this as an expectation that someone reading this will get those apps, but those are examples of things that can help you in life that don't seem important if you want to "just do something simple". But most smart phones CAN run some apps that you'd eventually find to be useful. Or easier. Technically my Samsung 2004 phone CAN be set up as a timer, but it's a PITA to do, and only takes seconds with the iPod/iPhone.
Anyway, when I finally do replace my 2004 Samsung, I'm going to get either a used iPhone 5 or 6. I still won't use a data plan though, I'll keep on with the T-Mobile plan I have now for voice and text only, and only have internet when I can use WiFi somewhere. And after I do that, then my left pocket won't have as much stuff in it, as currently I carry both the Samsung phone AND iPod Touch in that pocket. I'll use the iPhone to replace both.