So I bought an Otterbox for my iPhone 3G - it's a great case and it really does protect the phone but it does have it's downsides. One of these is the bulkiness, but that's not even too bad considering the amount of protection. The other problem is that when I am making phone calls, it causes an extreme echo for the other person. By this I mean the person will talk, then they will hear themselves say it again. It can be somewhat fixed by me turning down the volume alot - but then I can't hear them very well. I'm guessing this is because the vibrations from the ear-piece can not escape and vibrate back down into the microphone. So my question is, do all fully enclosed cases have this problem? I was looking at the DLO and Agent18 cases to be more specific, but I am also interested in hearing about less bulky (when compared to the Otterbox) cases.