I'm just curious if anyone else is having this problem. What is happening is that it seems like I lose my Internet connection even though I have full 3G signal. Any app that connects won't and I receive an error message or it just sits in limbo. Waiting for Apple to answer currently, but wanted to see if this is happening to others.
Have you tried resetting network settings in Settings? Have you tried turning Airplane mode on & off? How about a reset (hold the sleep/wake & home button until the Apple logo appears while ignoring the slide to turn off)?
My 3G connection misbehaves from time to time (sometimes just too many people accessing a tower can disrupt 3G) and those are the steps I use to correct the issue. Replacing the phone won't change the behavior if you're fighting other 3G users for a tower.