ATM may detain your card if: You enter the wrong PIN several times; Card is restricted; Card has expired; Card is physically damaged; Card was not taken back from the reader for too long; There was either a reader or machine failure. If the ATM froze, turned off during a transaction, or the reader stopped working, please wait for a while (about 5 minutes) because the machine may restart. If that happens, the ATM will eject your card, and if you leave the ATM too early, the card may be taken over by a third party. In case the card is stuck inside and there's nothing else to be done, notify the ATM operator about the card retention/machine failure. Each ATM has a sticker on with an emergency number to call.