According to a new rumor, Apple's next phone will have a titanium design with curved back edges.

The back of the iPhone 15 will be rounded to create a new border similar to the bottom edges of the MacBook Pro models, according to a user named AppleShrimp. The design of the iPhone 14 models is similar to the design of the iPhone 4. The last model to have curved edges was the Apple phone.

Despite the switch to titanium material, the iPhone 15 will have a back glass, according to the leaker, who has provided accurate information in the past.

It's not the first time we've heard that Apple will release a titanium phone. There were rumors earlier this year that the iPhone 14 Pro and the iPhone 14 Pro Max would have titanium alloy parts, but that didn't pan out as expected.

Patents related to the use of processed titanium with unique properties for future MacBooks, iPad, and iPhones were recently investigated by Apple.

Titanium is more resistant to scratches and has a higher degree of rigidity that makes it strong enough to bend.

Titanium's strength makes it difficult to etch, so Apple has developed a process that can give titanium enclosures a high-gloss surface finish. The appearance of oily fingerprints can be reduced with thin oxide surface coating.

It would be Apple's first use of titanium in its products. The titanium used in the Apple Watch Ultra is not the same as the titanium used in the physical apple card.

The iPhone 15 models are expected to be the same size as the 14 models and feature the same features as the 14 models.

Apple might replace the "Pro Max" version of the iPhone 15 with a new "Ultra" model, following its Apple Watch Ultra naming convention, according to Mark Gurman. It's not known if the titanium case rumor relates to a specific iPhone 15 model.