Those of you who have an AT&T iPhone 4 might soon find that your current iPhone 4 case or one you may have ordered will not fit the new iPhone 4S. According to the photo above, the volume buttons and vibrate switch have shifted slightly.
This design reflects similar to the Verizon iPhone 4, which could be expected since the iPhone 4S supports GSM and CDMA.
However, if your case was designed for both the AT&T and Verizon iPhone 4, it should fit the iPhone 4S just fine.
