what is the advantage of going iphone? why is it all the rage right now?
Because the iPhone is like the rice/r of the smart phone world. Sure, it's a good phone, and some of the owners are actually series about Apple and appreciate the company for what it is, but the majority of owners are douchebags that don't know anything about smart phones (or technology in general, for that matter), and are just jumping on another "it's cool, different" hipster/yuppy/psuedo-hippy bandwagon trend. I have nothing against the iPhone itself. I just can't stand the average misinformed "the iPhone is the end all-be all of smart phones for reasons I'm too cool to explain (aka I don't know)" fanboys/girls.
Anycrap, as others mentioned, if you're going to use the phone as your modem, you probably don't want to go iPhone. Right now, I think the Galaxy S2 is the best android phone out there. You don't want the Evo 3D. I wanted one since a couple of family members have the Evo 4G, and love them, but after really researching and playing around with the Evo 3D...it's actually a step DOWN in most respects. It uses 2 crappier 5mp cameras for the 3D effect vs. the single better 8mp found on the other HTC products, the pictures often come out blurry due to some issue with it constantly trying to refocus (have to snap the pic at just the right time to avoid the blur of the focusing), video looks terrible compared to the S2, speaker volume is really low, only has 1GB internal memory vs. 16GB in the S2, has a shorter battery life, much dimmer screen compared to the Super AMOLED on the S2, etc.
If you absolutely have to have a new phone right now, I'd go with the S2. It's more than enough fire power and feature loaded for the vast majority of smart phone users for some time to come. However, if you can wait a few months and want something even crazier, the S3 should be coming out soon. It'll have a 1.8ghz processor with 2gb RAM vs. 1.2ghz/1gb, 12mp camera, 720p screen resolution, FLEXIBLE Super AMOLED screen, etc. Overkill for most, but something to think about.
Also, whatever you decide to go with, the best prices I've seen on most phones is on
https://www.amazon.com/?tag=tcg21-20. The S2 from Sprint is $80 right now!