I thought some people may find this to be useful information. I purchased a refurbished 8gig iPhone 3G Black on December 31st, 2008 to take advantage of the $99 sale which was supposed to never happen again. Haha. I had been a Sprint customer for almost 10 years and was satisfied with the call quality and coverage but couldn't stand the customer service or crappy phones. My girlfriend was an AT&T subscriber and I have been an Apple enthusist for years and decided it was worth it. I received my phone in the mail 2 days later and even though it was 2am when I got home and saw the box I still decided it was time to activate and set it up. After about 20 minutes and no luck I went to bed. The next day I called AT&T and they told me to call AppleCare, which was closed. I decided to drive to the AT&T store where they couldn't figure out why my phone wouldn't activate and told me to go to call AppleCare. I called AT&T customer service from the AT&T store and before I could even finish my question the guy knew the problem and fixed it. I'm now almost 3 full months into the switch and I think it was absolutely worth it. Yes, the call quality is slightly poorer on AT&Ts GSM than Sprints CDMA, I can occasionally hear static on GSM and the voice isn't always that clear, BUT I get better signal in more places and the iPhone is incredible. I have not once regretted switching over, and am more than happy with the service. I hope this helps. - Eric PS: I'll be writing about how AT&T refurbishes iPhones next.