Accessory makers are betting that iPhone 17 Pro and iPhone 18 Pro cases will be interchangeable, despite rumors suggesting dimensional changes. Bloomberg's Mark Gurman spotted an Otterbox case at Best Buy labeled compatible with both models. Astropad's Matt Ronge confirmed similar supplier intelligence.

Leaked materials indicate the iPhone 18 Pro may be 2mm thicker, continuing the trend of increasing dimensions. However, conflicting reports exist, with some leakers claiming the iPhone 18 Pro Max will match last year's thickness. Apple sometimes provides early dimensions to case makers, but past rumors have proven inaccurate.

The safest approach remains waiting until official launch before purchasing new cases.