The majority of problems with the cancellation of credit cards occur when you travel internationally. Many travelers forget who the credit card is with, it's then many wasted hours calling United States and trying to find out which bank or institution the credit card was with. That's where the photocopies come in handy. The reason for this is simple. Many families have one credit card issued to them.
Many families have one credit card account number one have individual cards issued to each person.
The problem with this is if one person were lose their credit card, the others person's credit card would be canceled also, and you would have to wait until card was sent to you and three to five days. By each traveler having his or her own separate credit card, if one was lost, you could survive on the other credit card for a few days until the other is replaced. Some banks and credit unions cut off credit cards that are used 6 or more times in one day, to try and stop thieves from using stolen cards. If this happens to you overseas, you may find it difficult or impossible to have your card reactivated. Before going on an overseas trip on which you will use your credit cards, notify your credit card companies that you will be away overseas.