A:AnswerIt does come with a magnet to attach to your phonw. Personally i did not remove the adhesive cover and just placed it between the phkne and the case so I can use it on multiple devices.
A:AnswerMost likely, yes. Even magnets as weak as a refrigerator magnet have been known to cause issues and damage debit and credit cards. I can almost certainly say that these magnets would as well since they are much stronger.
