I have yet to replace my aging Samsung flip-phone. There are very good reasons why I’d want to replace it, though the main reason I haven’t yet is simply that I have yet to settle on something that costs less than half as much as the Smartphone of My Dreams.
That said, the secondary reason is fairly compelling in its own right. Once the phone has determined that there is a Missed Call, returning that call becomes its priority; several keystroke combinations that used to do something else now dial that number for you. If you just ignore it, a few hours later it will put up a Missed Call dialog box that, yes, defaults to redialing this number. And it never gives up: I let one go by for three days once, and the damned number would not go away. The only way to avoid it is about three menus deep, where it can be deleted manually.
Perhaps it’s never occurred to some phone manufacturers that there was a perfectly good reason why a call might not be answered. (My usual reason: “Who the frack are you? Go away.”) Misbehavior of this sort, alas, is not disclosed in the usual specification sheets.