Regarding the S3 (and S4 for that matter) I changed over to wireless charging a long time ago.
The kit includes a wafer thin card that goes over the battery and has a tiny connector that is already in the phone.
Then plug the cable from your charger ito the small charging pad that comes with the kit.
Whenever you place the phone on the charging pad, even when it's in a cover, it beeps and begins to charge, you'll never have to plug the phone in again and save all that wear and tear on the mini usb socket.
I bought my kit from China for about £30, Google is your friend! :wave: