I have figured out why mine wasn't working. The sleep mode was interupting the download. If you are having this problem, plug your phone into it's charger, open the app, select 'refresh' from the settings menu, and then set the phone down near your wifi router and go to bed. DO NOT hit the button to sleep the screen. The app should have marched through the blockchain by morning, and daily updates only take a minute or so. Also, after downloading the blockchain and finally seeing the coins that I sent it, I sent it more. It took less time for the phone app to see the transaction than it took me to pull my finger from the mouse and pick up the phone. Less than a second. It was "pending" (not unconfirmed, I think that I like that description better) of course, but it knew that it was there.
if your phone sleeps automatically you can setup so that it stays on when charging which i dont think is the default
Settings>Applications>Development>Stay Awake