but can you use it as a phone?
Oddly enough, no!

I love my iPhone, although I admit it does have some limitations. The camera is not great, can't do video, no zoom or flash, the battery life isn't all its cracked up to be and syncing it (assuming you want to do a backup) can take all night, but all that aside, its the best phone I've ever had and I use it every day.
As for some of the competitors, the Blackberry Bold seems to have pretty negative reviews going for it but I personally think its a pretty good looking phone. I have a friend with a G-1 and she swears by it. Maybe I'm spoiled with my iPhone, but I think the form factor on its own is a piece of garbage. Its ugly and bulky and I don't like the setup of the thing. I tried to warn my friend to wait for the "G-2" or whatever the next Android phone to come out for T-Mobile was going to be, but she didn't listen to me. I think Android's a solid mobile OS, but the G-1 itself doesn't work for me personally.