For years, the iPhone Pro had a sturdy steel frame, but that won't last much longer.

With the iPhone 15 Pro, Apple may be switching from a steel frame to one made of titanium, and not just because it sounds cooler. Titanium offers a lot of advantages over steel, not the least of which is that it’s much lighter, which would solve the iPhone Pro’s most embarrassing problem compared to the regular iPhone. But titanium has its problems, though it’s likely that Apple has used its extensive experience with metals to bypass them.

"From my professional experience, titanium certainly has some advantages over steel, particularly in terms of its strength-to-weight ratio, making it lighter yet stronger than steel. Its corrosion resistance and ability to withstand extreme temperatures also stand out. However, it also has its drawbacks, such as its higher cost and difficulty in machining due to its hardness," Azumi Shoto, metal expert and spokesperson for Japanese sword company Mini Katana, told Lifewire via email.

We know Apple for its cool computer products, but it is also one of the most advanced metal companies in the world and even has a team dedicated to metallurgy. Most notably, it knows about aluminum. Over the years, the company has developed a manufacturing process for milling its computer cases from solid blocks of aluminum (the Unibody process) and it also recycles waste aluminum from iPads to make some MacBooks.