Apple released the iPhone 4 to customers in the middle of this year. It could only be used on AT&T in the U.S. (Creative Commons)

Apple plans to start manufacturing iPhones with Qualcomm's CDMA chip by the end of this year. Customers who for years have clamored about AT&T's poor service will rejoice at the news that the phone will now be available on Verizon's network, which customer surveys show is more reliable.

AT&T has been the exclusive carrier of the iPhone in the U.S. since it was released in 2007.

A source also told the WSJ that a separate iPhone 5 is in development. The smartphone would have a completely different size than the current model.