AT&T and Verizon's iPhones can't be that different, right? Swap out the GSM radio for CDMA, tinker with the GPS a bit, and you've got a Verizon friendly iPhone. Apparently with a few app makers like Telenav releasing Verizon specific products for the App Store, there may be more differences under the hood than previously thought.

Telenav reportedly stated that their original AT&T Navigator app was not working right with Verizon's version which forced them to come up with a Verizon-specific app. While specifics weren't shared about the incompatibilities, this is opening up a whole new issue that app developers may have to tangle with both now and in the future. Fragmentation of the App Store could initially be a mess with so many iPhone 4 preorders ready to hit the streets. Will running apps on the Verizon iPhone be a crapshoot? WE won't have to wait too long to find out.