Yeah, I know that sometimes banks will put a stop on your card when you try to use it in the Phils...even when you've TOLD them you're going to be using it there !
Hence, my thoughts of a backup.

Last time I had that kind of trouble, my bank back here said it was not a problem of their making, but rather that Visa/Mastercard had put a stop on at the Manila end....suspicious use, or whatever. Hopefully things have improved now.