Earlier quoted context omitted.
I've had the pleasure (?) of going on vacation without notifying the card company. Because a hotel was late with a correction to their charge, that showed the card in use at two places at once, so they shut it down. While I was on vacation. That got... uncomfortable. Fortunately, they only shut down my card. My wife's still worked, and we were able to proceed. It made for a more stressful vacation, though...
My wife had her wallet stolen in Florence while we were traveling. It turned out that some banks will give different numbers to each card and other banks (Bank of America) will give the same number. We had to cancel the BofA card that I had. Fortunately our CapitalOne card used different numbers and we were able to keep traveling without a lot of hassle. For our next trip, we're going to make sure there's no number o…
That is: My wife and I have cards that have the same number on the front. On the back, though, the three-digit... I forget what it's called, but there's this additional number that is not embossed into the face of the card. Her card has a different one of those than mine does. And the bank can tell the difference, can tell which card made the purchase, and can shut down one but not the other.
So it doesn't matter if the two cards share the same main number, as long as the bank can tell them apart.
Does BofA give different three-digit extra numbers to their cards? Do they give the same extra numbers? Do they give extra numbers at all?