A:Answer SURELY YOU CAN USE THE SAMSUNG GALAXY J3 IN MEXICO, IF IT IS UNLOCKED (BANDA ABIERTA) WITH A CHIP FROM MEXICO. IF YOUR ARE IN A SERVICE AREA SERVED BY THE OPERATOR THAT PROVIDED THAT SIM CARD (CHIP), AND IF YOU HAVE PURCHASED MINUTES IF THE CARD, THE NUMBER, IS PREPAID (PREPAGADO). OR IF YOU HAVE PAID AND ENROLLED IN A CONTRACT (POSPAGO). I BOUGHT AN UNLOCKED GALAXY J3 FOR SOMEONE ELSE AND IT WORKS IN COLOMBIA WITH A CHIP FROM THERE. TOM