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I haven't encountered a single mini-USB port that I couldn't use with any mini-USB cable (however, these are mostly devices that I don't use as often as a phone, so my view may be biased).

Micro-USB ports, on the other hand, just stop holding connectors, even after I cleaned the port.

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The springs that hold the micro-USB connector in are on the connector itself. I have one cable that barely holds on to my phone, but brand new ones lock in tight.

If a micro-USB port doesn't seem to hold anymore, I would replace the cable first.

I had great success cleaning a 3 year old phone. I basically had to scour the bottom of the port with a sewing needle though.

But after I did that, charging went from maybe to not a problem.

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