Silicon iPhone 3G cases are the most slimmest and most comfortable solutions for iphone.
There are two types of these silicon cases.
1.One type is the ordinary type which is extremely similar to old iphone cases.
2. The other type is like this...
The differs are the opening at the top front, one type is the and wide large slot, the other is a slim slot and hole due to there are there important part in Iphone that can't be coverd - the speaker,Proximity and Ambient Light sensors.