Apple released its first foldable phone, iPhone Duo, on Sept. 10 and set its mainland China price at 15,999 yuan. The iPhone 18 Pro starts at 9,999 yuan, while the iPhone 18 Pro Max starts at 10,999 yuan. At the current Bitcoin price, iPhone Duo costs the equivalent of 0.025 BTC. Historical estimates show the Bitcoin cost of the top-tier iPhone model ranged from 0.169 BTC for the XS Max to 0.010 BTC for the iPhone 17 Pro Max, with the iPhone 18 Pro Max estimated at 0.016 BTC.