I'm currently using a flip phone, and I love it. I can call people, and have them call me. I can receive text messages, and send them with enough difficulty that I don't feel obligated to put much effort into them. I can set alarms and appointments. I can leave it sitting around for weeks without needing to charge it. I can hold it out in front of me and drop it onto a hard surface, simply to prove the point that I can.
However, the one thing that I can't do is easily sync those appointments somewhere where they will be safe if the phone is lost. I'm considering being given a smartphone as a gift for the sole purpose of being able to do this. Beyond that, I have very little interest in anything else a smartphone would have to offer. Possible exceptions include maps if one ever becomes relevant, and maybe checking email. I have no interest in media functionality, and I have a better portable device for gaming.
What sorts of things should I be looking for here? I'd basically like the phone to resemble a slightly smarter flip phone as much as possible. A tiny profile is good, and durability is good. Is there anything like that that's generally available? Do I even need a smart phone to get what I want, or are there non-smart phones that can sync with online calendars?