Bloomberg Businessweek reports Apple is readying the sale of the long-awaited white iPhone 4, which should become available by the end of April. The publication mentions “three people familiar with the plans”, and claims the device will be available both on AT&T and Verizon in the United States.

Apple Inc. will begin selling a white model of the iPhone 4 in the next few weeks after a 10- month delay, according to three people familiar with the plans.

The new version will be available from AT&T Inc. and Verizon Wireless by the end of April, said one of the people, who asked not to be identified because the plans aren’t public.

Last month, Apple’s Phil Schiller confirmed with a tweet to a customer that the white iPhone 4 would be available in Spring and that it’s a “beauty.” The release of the device was delayed multiple times in the past due to alleged production issues with the white panel. The exact reason why Apple delayed the initial June 2010 release date hasn’t been revealed by the company, but previous speculation suggested problems with the white paint caused the device to take bad photos due to light leaks. A rumor also pointed to Apple relying on a new Japanese paint for its white iPhone 4; it’s not clear at this point whether the unit will launch by the end of April only in United States, or internationally as well. Apple was also rumored to be considering a white version of the iPhone 5 for a summer 2011 launch – although recent rumors about a “delayed” iPhone 5 in September with a WWDC focused on software doesn’t leave much credence to the original report. The white iPhone 4 recently showed up on various international carrier websites and Best Buy internal inventory systems.