Thought I would post this from what I just learned.
I called into MasterCard to give them dates/destination for a upcoming trip as I always do. They now ask you for the phone number you are at, is that your home phone?...and if it is, they hang up and call YOU back. Then they give you the collect call number for them in case something goes wrong with your card...lose it, stolen, etc (it was different than the one printed on the back of your card in that tiny print (!!!)...they record the dates and destination of your trip...and then give you a reference number to carry with you in a different spot than where you carry your financial cards.
If you have problems and need to phone MasterCard, you NEED this reference for them to open a case about your card. Don't have it...might not have anyone to help you was her response.
Interesting!! She said that due to the increased credit card fraud that is happening everywhere, it has come to this! (I AM NOT JUST talking about Mexico here).
Always make sure whatever financial cards you plan to use, credit, debit or ATM's...that you notify the financial source...or you may only get the first use out of that card, and it will be stopped...or maybe not even a single use!