Sorry for resurrecting an old thread, but I'm starting to wonder whether Telcel's website allows reloads with US cards at all. From what I've read online, "some" US cards supposedly work but every single card I've tried thus far (Chase, BMO/Diners Club, Capital One 360) and PayPal have resulted in the same error message telling me to contact my bank. It doesn't seem like it's actually going much farther than Telcel's servers either as I don't get the typical fraud alerts when something declines.

Thoughts?