General should I upgrade to SG3?

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http://androidforums.com – I currently have a Motorola Phonton 4G with sprint. I'm eligible for my upgrade, so I was thinking about getting the SG3, which seems awesome. However, I live in Pittsburgh, which currently doesn't have 4G LTE...and it doesn't look like it's slated to get it until end of 2013 or later. So it seems that keeping my Photon with 4G (from what I've been reading this is Wimax?) instead of getting a phone and being forced to use 3G, is the better option? The Photon has been kind of annoying as of late, which is why I'm thinking of upgrading. But The 3G issue kind of sucks....may be worth waiting (General)