If the rumours hold true, the iPhone 15 Pro variants are expected to kick off with a baseline storage of 256GB, a jump from the iPhone 14 Pro's starting point of 128GB
iPhone 15 Pro Rumored To Have 256GB Base Storage, Also Come In 2TB Option - iOS Hacker
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Base iPhone 15 Pro Model To Start At 256GB Of Storage Amid Rumors Of A Price Hike Of Up To $200
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iPhone 15 Pro storage may start at 256GB, max out at 2TB - 9to5Mac