There were misunderstandings on both sides. The metal back of the iPhone won’t interfere with signals or act as a Faraday cage. Modern phones are designed to avoid these issues.I went into one of my local carriers and looked at the iPhone 15 a couple days ago. I was looking to upgrade from my iPhone 12 and wanted to see if the hardware features were worth the effort. The first thing that gave me pause was that a store employee told me “the back of the iPhone 15 is metal so you don’t need a case”. I tried to argue that having a metal case would interfere with radio communications.. I even asked him if he knew how a faraday cage worked. He said I didn’t know what I was talking about, “metal conducts electricity”, he said.
Aren’t those people supposed to know what they’re doing?
Anyway, after going back home and doing some research I returned to that store and upgraded to an iPhone 15. I’ll have to admit, I didn’t think the Dynamic Island would be all that useful but it’s growing on me. I don’t think I’ll be putting as much faith into the statements that carrier employees make going forward.