His data plan will work, however, it will only stay in EDGE.
iPhone uses different frequency for wireless network.
I believe, its missing the 1700.
I disagree, my sister has her unlocked iPhone 3G on our Tmobile network and plays around on 3G all day... no issues. That was one of her concerns, the limited functionality...
She found it really hard to give up my old Motorola Cliq, LOVED the android, but since the iPhone was given to her, she wanted to use it... not to mention the screen and overall feel reacted better. No doubt the iPhone is better than the Cliq, but better than the Vibrant? I really do have to side with the Vibrant.
I've had an iPhone before, and on the ATT network. I was blown away by it. I loved every minute of having that phone, this was even before the App Store was launched. However with today's phones out, the Nexus, the Galaxy S, the EVO... you have to admit that Apple's hardware is no longer standing in the limelight as the cream of the crop.
And I to agree with the above comment, New phones will alway be coming out. If you spend your time waiting for the next thing, you'll always be waiting. What i did before buying my Vibrant is to look at all the phones online, see which one's i liked. Then look at the specs, user reviews, and then go down to the store and mess with it. If it reacts how i want, has the features i'm looking for, and generally feels like i can hold on to the phone for a while without feeling like i really need to upgrade then i'm all good.
Sure the GPS problem is a bit annoying, but i dont use that everyday. Plus Google just sent out an update for their Google Navigation app, that seemed to fix the issue. Before, i couldnt even get my phone to lock onto my location, now it dies, although not too terribly accurate (within 1000 meters), it still is decent.
And i'm quite surprised of the responses here. You actually got a balanced and non biased response. Most forums i frequent, if you were to ask a question like that, you would be e-flogged for asking and made to look like a fool.
Try going to the 350Z forums and asking what they think is better, the mustang or the 350Z.
Great Job Android Guys.