I've rightgraded from smartphone to flipphone, and am mostly happier for it. There are a few exceptions, the principle one of which is transit apps -- NextBus and its kin are life changers when it comes to using and really being able to rely on public transit (and that's even though the apps and their interfaces still suck in many, many ways).
It turns out that there is a minimal Web interface to the one transit app I've used to date that works with my flip-phone's very minimal Web browser. I'm not sure if that's sufficient for me or not (I'm starting to think that it would be really cool for local stores and such to post pending arrival times for nearby stops).
I've also still got my old Android device which as a WiFi mini-tablet is still somewhat useful. Though I'm strongly favoring replacing that with a Nexus tablet. The ability to carry around the several thousand texts I'm currently researching would be a bit of a bonus.