not entirely true. In order to work on TMoUSA, it needs 1700 and 2100, not only one, so if these aren't on the Euro model, and they aren't, you'll only get EDGE data speeds.
Not entirely true, either. Before recently, the only way to get Symbian Nseries phones was importers. I regularly bought from overseas and had shipped to the States. I had my warranty. Here's what I usually do: Go to Nokia.com and register your device online. That's it. Any problems, just do a trouble ticket online, and they schedule the repair, and tell you where to mail it. I usually got it back in about 4-8 weeks, and usually got it replaced if anything seemed hard to repair. Always treated nicely and always got my device back working perfectly. But backup first, because they always flash to the latest firmware before sending her back home.