So far the Iphone has been a great device. I have had better reception with this phone than my blackjack. The mail features are really easy to use and nice.
I did jailbreak on my phone to store / move files and so far it has been a fantastic device.
With this handy step by step guide, I was able to ssh into my phone and now I can use it as a modem.
Step-by-Step Guide to Jailbreak iPhone 3G using QuickPwn (Windows)