Apple has sold a record number of iPhones during its initial pre-order weekend sales, topping the charts with 4 million units moved between when it kicked off pre-sales early Friday morning and the end of the same day, reports Darrell Etherington. The store experienced some technical problems owing to volume, but that didn’t stop the 6 Plus from selling out quickly, followed by the iPhone 6 later in the morning. Apple claimed a “record” number of preorders on Sept. 12, before announcing the official total today.