do you not consider your phone a "useful computer"?
I certainly don't. You simply cannot get actual work done on a phone anywhere near as easily as on a real computer. There's a reason that companies issue laptops (or have desktops even) instead of giving employees a phone.
I'm guessing they mean one of the following:
-Installing software without App Store approval filtering
-True multi-tasking and background execution (though this hurts battery)
-Write iOS apps from an iPad