Excerpt from a Wozniak interview:
What's your favorite phone?
The iPhone, because of the apps. By the way, I solved the problem of battery life and [the lack of] multitasking on the iPhone.
Yeah. I just have two iPhones, so if the battery runs down on the first one, I can use the other. And if I'm talking on one, I can use the other one to look something up. You would not believe how much use I get out of that.