Why don't they just send an iPhone to control the mars rover? Radiation? What does radiation do to electronics? Do they corrode? Will things short circuit? Wo

Why don't they just send an iPhone to control the mars rover? Radiation? What does radiation do to electronics? Do they corrode? Will things short circuit? Would shielding an iPhone be more expensive than using outdated parts? Do we know that the iPhone isn't reliable enough? Mine seems to be fairly reliable. Any problems with it are solved by a simple reset. Certainly a small bit of old battle tested code/hardware could handle this problem. Is the benefit of having modern hardware not worth it? I'm sure all of these questions have answers, but it's not like I know where to find them.