Farrell, don't upgrade the iPhone software to 1.1.2 yet. Depending on which software you used to activate and unlock the phone, you shouldn't really upgrade to iTunes 7.5 yet either.
I've had an iPhone for about a month now running over in the UK with no problems. Best phone ever and on some trips I won't even take my MacBook any more.
My last phone, Nokia E61 did the WiFi browsing for me but the iPhone and Safari just blow all other phone browsers and internet access away.