Subway gift card funds can be stolen if you register them on the subway site. Apparently anyone who has another subway card can transfer your funds to their card. Subway will not stop this. There is no customer service representative to help you. You will lose your funds. DO NOT BUY SUBWAY GIFT CARDS.
It is unfortunate that the company will not support its loyal customers. You can only contact via web and they dont respond fast and it is always the wrong information that is sent back. They need to bring back a live customer support center to address these issues.