Phone Cards

Hi, I would rather buy a phone card before going to Mexico--can anyone recommend one? Thanks!

I WOULD DEFENTLY USE ONE THAT IS ATT OR MCI AND I WAS TOLD THIS BY MY HOTEL IN MEXICO BUT IF I WERE YOU ID GET THE NUMBER OF CUSTOMER SERVICE OFF THE CARD BEFORE YOU BUY IT AND CALL THEM AND MAKE SURE YOU CAN USE IT IN MEXICO THE ONE I BOUGHT IN MEXICO WAS CALLED TELNUM AND WE HAD A DEVIL OF A TIME USING IT. ONLY GOT TO MAKE 2 CALLS BECAUSE IT WAS IN SPANISH AND WOULDNT WORK FROM OUR ROOM FOR US. THE HOTEL PEOPLE HAD TO COME BOTH TIMES AND THEY HAD A HARD TIME MAKING IT WORK BUT THEY FINALLY DID GET IT TO.