Add the iPhone 4 (rev A) to the device list.  

The identifier for this is iPhone3,2.  This is the 8gb variant that was released as the iPhone 4 was sent downmarket.

As the iPhone 4 is decidedly low performance compared to the other iOS 7 capable devices making sure all of them are correctly identified is important to adapt the experience as needed.

Ref: http://theiphonewiki.com/wiki/Models