Here's a handy hardware features comparison between the previous gen SGS3 and the new SGS4.
Source: Engadget
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Wrong info, S3 has external SD support
No way I can upgrade without losing my unlimited unless I pay retail? (Verizon)
Get a friend or family member that doesn't need an upgrade to do it (haha, my parents will never get a smartphone) and then swap phones.
If you sell your current phone on EBAY you'd make a few bucks. But, heck, I doubt I could get $200 for my unlocked Rezound. If I could, $450(?) more to get the S4 retail? That's only an extra $150 or so.
I've only had my Rezound for about 15 months. Little longer than I was aching to upgrade the OG, but I'm actually still good. Maybe when the S5 comes out I'll think about paying retail...
Yeah, the friend/family member won't have much success. I'm still on the family plan with my family since I don't want to lose my unlimited. Hehe. My entire family has the Maxx except for me, D4. Even my mom has a better phone than me. Lol. If only there is a phone that has the Maxx battery, Rezound's camera, and D4's awesome keyboard, I will definitely will go ahead and purchase retail. I'm still waiting if there will a D5, but I just don't know. I'm thinking about selling my D4, but I doubt that i'll fetch good money for it.