Finally did get RTM events to show up in iPhone 4s Calendar, and not sure what I did wrong in my first try.
Initially tried to subscribe to "iCalendar Events Service (All Lists)" per instructions (as I understood them) and nothing showed up in the Calendar. (In Safari I browsed to the Info page in RTM Settings, copied the iCalendar Events Service URL, pasted it into the proper Settings field on the phone.)
I deleted the subscription from Settings and subscribed instead to my default list, which is my only "real" list - all my other lists are smart lists.
(So my default list is inbox; it's also my only real list; I have an "all tasks" smart list which matches anything and is redundant to my default inbox list, but would not be redundant if I started to use multiple real lists; and then I have several smart lists.)
Is there a reason why, given the way I have RTM set up, subscribing to all lists would fail, but subscribing to my sole real (and default) list would work?
I also was able to successfully subscribe to my "all tasks" smart list.
Posted at 7:43am on March 3, 2012