at the advice of my host, I changed from Super Cache to W3 Total Cache.
I've noticed that mobile phones (at least on AT&T but probably other networks as well) show old content - a day older or more. Clearing the W3 Total Cache solves this problem temporarily, but then of course as soon as another post is posted, phones won't see it.
Browsers (logged out) seem to be fine.
I have page, minify, database and object all on, but the others off.
Any advice would really be appreciated. In this day and age, you could see how this might be a problem.