So Apple didn’t announce that all-new iPhone 5 you were so desperately longing for, but the good news is, you can use your current stock of iPhone 4 cases with your new iPhone 4S, right? Wrong!

While Apple’s new iPhone looks the same as its predecessor, there’s a very subtly difference that may mean some cases won’t fit it.

If you’ve been using a Verizon iPhone, then you’ve got nothing to worry about, because the iPhone 4S is exactly the same (externally) as the CDMA device. However, if you’ve been using an AT&T (GSM) one, things are going to be a little different.

In order to accommodate the redesigned antenna on the latest iPhones, Apple had to move the mute switch and the volume buttons ever so slightly. They’ve only been shifted down a tiny little bit, but for some cases — those that only just accommodate the mute switch and volume buttons — the difference means your case will no longer fit.

It may be a good idea, then, to pick up a new iPhone 4S case when you get that shiny new iPhone on Friday.

[via Gizmodo]