iPhone doesn't connect to micro-cell, at all, ever, under any circumstances
Had this micro-cell for over a year. Worked OK with my Blackberry. I switched to a Moto Atrix, that works OK too.
My wife used to have an iPhone 3, never worked. Now she has an iPhone 4, it does not work with the micro-cell. No amount of power-cycling of various devices has ever convinced the phone to connect to the micro-cell, not even once. Yes, she's on the list of allowed phone numbers, as the device is managed off her AT&T Wireless account.
The problem is not that it picks up a regular cell tower -- none of those are in range here. (That is why we bought the micro-cell.)