Want the answers to questions about the iPhone? You'll find questions and answers here.
I understand GSM means it has a sim card, but what's the difference between GSM and GSM-r2 for iPhone 4?
Where are you seeing a reference to "GSM-r2"? It's not a designation I've ever seen Apple use, though I could have missed it.
I'm not seeing Apple use it either, saw it on someone's craigslist post so I want to find out if it has something to do with firmware, or maybe it's refirbished. Yahoo answers definitely didn't help, so I came to this forum. I don't think it matters, just curious.