How to solve the problem of bad contact between data lines and mobile phones?

First prepare a 2B drawing pencil. Why use an aluminium pen? Like other ballpoint pens, can't you? The principle is simple, because pencils are made of graphite, which is a good conductor.

Smear with pencil at the charging interface and data line interface (copper sheet) of the mobile phone. Smear the copper sheet black. Be careful not to exert yourself. Blow out the pencil foam and insert the cell phone and the data line into each other, shake the plug slightly left and right, you will find that there are few problems with false connections, much tighter than before.

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