People stand in front of an Apple store in Beijing, China, on April 9, 2025.Tingshu Wang | ReutersApple on Friday raised the amount of money people can get off their next iPhone in China by trading in their old device, rolling out further incentives to spur demand in a crucial market.The iPhone 15 Pro Max now has a trade-in value of up to 5,700 Chinese yuan ($791), an increase from 5,625 yuan previously. For reference, a brand new iPhone 15 Pro Max starts at 7,999 yuan in China. The iPhone 15 Pr...