There might be an advantage for those extended AppleCare+ warranties after all huh? For instance, if you have a bad iPhone 4 still under warranty, now is the perfect time to get it replaced with an iPhone 4S for FREE due to iPhone 4 supply constraints:

Per 9to5Mac: “Due to atypical inventory shortages of white 16GB iPhone 4 replacement units, 16GB white iPhone 4 customers seeking hardware replacements at Apple Store Genius Bars may get a free upgrade to the newer iPhone 4S.”

“According to multiple sources, Apple has notified Apple Store Genius Bars that inventory of white iPhone 4 16GB replacements units is heavily constrained, and until further notice, stores lacking white iPhone 4 16GB replacements units should upgrade customers seeking a replacement phone to an iPhone 4S.”

Though the 4S will be refurbished, so is the iPhone 4 if they had it. With a 4S, you get an 8MP camera, A5 chip and the lovely Siri. Why not?