With reports of antenna problems over the last few weeks, you might think that Apple’s new iPhone 4 is sitting on store shelfs, but that’s not the case. The truth is, Apple can’t keep up with demand for the device. “The demand for iPhone 4 is absolutely stunning,” said Apple COO, Tim Cook, during the company’s earnings conference call. “We are selling every unit we can make.”

Cook went on to say that Apple is working very hard to bring the supply and demand curves in line, but they have no idea when that happen.

Apple said on Tuesday that it sold 8.4 million iPhones in its fiscal third quarter, representing a 61 percent gain over last year’s third quarter.