So I understand that while the phone is optimized for WiMax 4G, I read on XDA and elsewhere on the internet that the Photon, with a firmware update, could operate on LTE. I also read a story that a Verizon 4G LTE SIM card worked in a Photon (a worldphone) and that a few engineers think it would work with LTE. Whats the true deal on this? It is one of the newer 4G Sprint devices.