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Magnets are harmless to electronics.
The only exceptions are magnetic based devices, such as:
* Magnetic storage. VHS tapes, floppy disk, and hard drives. They aren’t that susceptible though, it’s not like a magnet anywhere near them is doom. Modern hard drives in a computer or laptop (if not already SSD) are magnetic based, but not exactly easy to wipe with a magnet vaguely near the computer. I wouldn’t go rubbing rare earth magnets directly on a drive though.
* CRT TVs and monitors, the big, old, heavy ones. A magent near then will temporarily distort the image and colour. Electromagnets aim a beam to make an image, so a magnet alters the beam path.
A phone/tablet has none of these. It has solid state storage, and it has an LCD or LED screen. Nothing magnetic based.
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