Magnets don’t damage computers, in and of themselves. They *can* damage magnetic media like floppies and hard drives (but not SSDs), and they can also damage CRT-based monitors in certain circumstances. But a machine that doesn’t have any of those things -for example, phones- can be around most magnets without any problems.
Technically, a really strong magnetic pulse can damage even solid-state electronics. But you’re not likely to encounter magnets strong enough to cause that kind of damage in everyday life.
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