Anyone else having an issue where 3g data isn't working on the iphone4? It was working earlier today, but various speed tests have resulted in extremely unreliable results. Latency times have ranged from 400ms to 45000 ms. Both upload and download speeds have ranged from 0 to 1.5mbps depending on the attempt. Web pages don't load or load very inconsistently. I'm able to get around the issue by turning off 3G data and relying on edge. Anyone else getting this? I'm on AT&T in AZ-US.