“In mid-April we reported that due to constraints of replacement units for the discontinued white 16GB GSM iPhone 4, Apple Store Genius Bars were told to swap out these devices for a 16GB white iPhone 4S,” Mark Gurman reports for 9to5Mac.

“While Apple has caught up with that SKU, Apple is now facing constraints of the black 16GB iPhone 4 and black 32GB iPhone 4 (GSM/CDMA unit breakdown is unclear),” Gurman reports. “Like with the 16GB white iPhone 4 constraint situation of mid-late April, Genius Bars without stock of the black 16GB iPhone 4 and black 32GB iPhone 4 replacement units have been instructed to provide customers with comparable iPhone 4S replacements.”

Read more in the full article here.

MacDailyNews Take: Anybody get a free upgrade?