It was clear as far back as 2017 that metal is the preferred material for a phone body. But which metal? Aluminum is the default, Apple used stainless steel for a few years before switching to titanium and Samsung followed that move too. Each has its advantages. Aluminum is cheap and light. Stainless steel offers great strength, but is too heavy. That may be why Apple had to switch to titanium – it’s more durable than aluminum but lighter than steel. For example, the iPhone 14 Pro Max weighs 240g, the 15 Pro Max is 221g. Titanium is, of course, hard to work with and expensive, so it’s...

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