By | October 11 2011 8:22 AM

iPhone 4S, the latest iPhone that was launched on Oct. 4, a day before Apple's co-founder Steve Jobs passed away, was sold out on its very first day of pre-order (Oct. 7). Within first 24 hours, one million units were sold out, surpassing the previous single day pre-order record of 600,000 held by iPhone 4 in 2010.