KT, the exclusive carrier of the iPhone in South Korea, saw more than 120,000 pre-orders for the iPhone 4 on the first day of sales. According to a Korea Times report, KT’s ordering system was jammed early in the day, leaving customers unable to order for roughly two hours. “I really appreciate this enormous support from our customers, and I also apologize for the discomfort caused by the ordering system. We will do our best for flawless delivery of the product,” Pyo Hyun-myong, chief of KT’s mobile business, said on his Twitter account. The 120,000 pre-orders handily broke the record for highest first-day mobile pre-orders in South Korea; the iPhone 3G also broke this record during its pre-order period, with 55,000 orders made over five days.