(Answer requested by Julian Diep)
If you can’t just blow the dust from the port before each use, and if a phone-enclosing case is overkill, try a plastic or rubber “USB Port Cover;” a malleable, nonconductive plug that fit snugly into an unused USB socket, preventing debris from entering.
They’re available by the gazillions online (Amazon, Ebay, etc.), and are very inexpensive.
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