For a phone that's pretty good. The exposure seems very constant.

How big are the pictures you get off the phone?

Or does it string them together to a movie automatically?

The downside of it would be you need your phone and can't leave it at the window 24 hours :P

I got a huge question. I downloaded TimeLapse, but the program closes after a few minutes cause my iphone goes to sleep and I dont know how to change that. I looked at the lock feature and the best i can do is 5 minutes. HELP!