AT&T just came out with a deal on cells that work in mexico

A few weeks ago I was shopping for a phone plan that would work in Mexico and AT&T’s plan required that more than 50% of the months calls must originate in the U.S. or they will terminate the service. Since we will be in Mexico for 4 months and 100% of our calls would be from there the manager of the AT&T store we were at said their plans wouldn’t work for us. Is this a new plan without the requirement that 50% of the monthly calls originate from the U.S.?