Do you have problems with mobile phone charging leads falling out?
 

If you have problems with mobile phone charging leads falling out, specifically Micro USB connections as used on most mobile phones with the exception of Apple, do what I did.
I took a fine needle (not a pin) and gently poked around inside the connector in the phone. A lot of fine dirt, fluff et al was dislodged from inside the connector.
Now the charging lead stays firmly attached to the phone. :D

Done it again.
The amount of fluff coming out of the USB socket is surprising.
And now the charging lead stays in now ! Car vibrations don't dislodge it anymore.