I'm facing quite a similar issue as well, but it will only happen when i turn off 3G to save battery and let it run on edge. When i switch it back to 3G, it takes sometimes to switch itself to 3G from edge. And the time taken to switch is vary, sometimes fast, sometimes takes a few minutes, and ive tested on iphone 4 which it switched instantly. But when it captured 3G signal, it stays there forever until i turn the 3G off again. I'm with Celcom and the 3G speed is very good at my place, it can go up to +/- 7mbps upstream and +/- 2mbps downstream. But tested with iphone 4, it can only max up to +/- 2mbps downstream. I think Celcom HSDPA max speed is only 7.2mbps (theory) and HSPA+ is 21mbps. Not sure if they already have DC-HSPA...my 2 cents