On Monday, Apple released iOS 5.1 Beta to developers for testing, and upon dissecting the code it was uncovered that data for an unreleased iPad 2 model was referenced. Deep in the code for iOS 5.1 was the name of what appeared to be another device, called iPad 2, 4.
iPad2,1 – Wi-Fi iPad
iPad2,2 – AT&T iPad 2
iPad2,3 – Verizon iPad 2
iPad 2,4 is predicted to be Apple’s iteration of a Sprint iPad 3G, which is currently not available. In recent months, it was rumored that a Sprint iPad was in the works, but after the release of the iPhone 4S on Sprint, it’s highly possible that the iPad is made available on Sprint too. It is currently unclear whether Apple will wait for the release of an iPad 3 to add on Sprint to its list of iPad carriers, however, there is a very likely chance that the iPad 3 could be introduced as “world tablet” supporting all carriers on one device.
The iPhone 4S currently has the ability to support Verizon, AT&T, and Sprint all on one device. This allows Apple to manufacture more devices, at a faster pace, without having to worry about accomodating carriers. If Apple was to sell a unified iPad, it may come in the form of an iPad 3, giving customers their pick of carriers from AT&T, Verizon and Sprint.