1517 ET - AT&T's opening salvo in the next Apple iPhone cycle shows the carrier is still hungry for new subscribers and eager to keep its current ones happy. The US carrier announces Tuesday it will give eligible customers a free iPhone 13 Pro--which starts at $999--along with deep discounts on other versions of Apple's new flagship handset. The generous offers require a traded-in device, unlimited data plan and a three-year customer commitment, showing AT&T's focus on subsidizing customers' new smartphones in exchange for reliable service revenue in future years. The next question for investors is how rivals Verizon and T-Mobile US respond. (andrew.fitzgerald@wsj.com; @drewfitzgerald)