I started to use iPhone after moving to NYC. It has been 2 months. I want to say it really changed some part of life.
First, I rarely open my laptop at home now. Almost all casual tasks can be done on iPhone, with an as good or even better user experience. Email, twitter, IM, video call, search, browse web, ebooks, a little bit music sometimes… All well supported by iPhone. The only chance I need to open laptop is for playing some pirated movies, actually. Or serious works like reading a long doc, but that’s more of an office case.
Second, I’m even more closely bound to Internet now. I have been a heavy user of Smart Phone (if BlackBerry can count :/) for years. However it was in China and it was stupid BlackBerry and poor 2g network. The bandwidth and the fucking GFW limited my mobile digital life to an eunuch level. Now, welcome to Zion… Unfortunately, or fortunately, I still have 1.5 hours Internet-free time each weekday because of subway. But it’s definitely not iPhone-free. Kindle app and Podcaster are my company.
Last word: I used an Android phone in US for a few months. It’s not the same thing. User experience matters. It determines whether you want to stick to phone or open a laptop, though the difference is hard to be measured.