As cell phones continue to become more and more like what we used to know as a PC, we’ll start to see more of the problems crop up that the PC faced. Chief among, it’s becoming clear, is fragmentation. With the advent of operating systems like Android and Windows Phone 7, handset manufacturers are increasingly under pressure to put out better handsets.

With the iPhone, everyone has the same hardware, and because Apple earns profits from both the hardware and the software and controls the production of both, there’s no real rush to make a new handset. The hardware manufactures for Android and WP7, on the other hand, are in a sort of arms race. Every month it seems there’s a newer, faster Droid on the market. Something with a better camera. Something that runs Flash. Something with more RAM. Something better. That race is leading to a serious fragmentation, at least with Android, and it’s affecting the user experience.

Angry Birds has become one of the most popular games across several mobile platforms, but the developer has struggled to keep its product functional on all Android devices. The developer, Rovio Mobile, said that it will be creating a second version of the game for lower-end Android handsets, citing “severe performance issues.” While this isn’t a huge issue now, imagine two years down the road when there will be ever more hundreds of thousands of apps and a marketplace cluttered with new and old handsets. It will be a mess.

Of course Apple isn’t totally exempt from this issue. Its own handsets have changed significantly year after year, giving way to some high-performance applications that simply won’t run on the original iPhone or even the iPhone 3G. As time wears on, though, I would expect Apple will see significantly less fragmentation than the operating systems with secondary hardware manufacturers. There have been rumors though, that Apple is creating an iPhone “Lite” as well as the current iPhone 4 and a CDMA version of the phone for Verizon. Sounds an awful lot like fragmentation to me.