Sorry, you can’t get WiMAX (NTC Y-MAX) in your smart phone as it requires CPE (Customer Premise’s Equipment) like Outdoor or Indoor Unit (IDU / ODU) or compatible USB dongle which captures WiMAX frequency and then translates to your device.
However, we have also heard about WiMAX compatible smart phones (some of them Verizon logo embedded) if you have checked the frequency functionalities, all the best.