The Iphone has a lot of issues specifically the battery, reception problems look at reviews before takin the pludge as of right now its not lookin so good but then again i might be biased im not an Iphone lover " MotorolaQ9h all the way ".
These specific problems were found over the web from users of the phone soo im sure if you do a little searching you will find it too.
GSMArena.com - GSM reviews, opinions, votes, manuals, ringtones and more... lists all the phones in the market and user reviews currently there are 2500 reviews of the Iphone3G soo enjoy the read.