Check out this spreadsheet. If you scroll to the right and look at the top of the columns, you will see if any particular phone supports LTE 800, LTE 1900 and LTE 2600. You will see that the LG G2, Galaxy Mega 6.3, Nexus 5, GS4 mini are the only triband LTE phones. Also the HTC One is only single band LTE 1900 supported.
http://s4gru.com/index.php?/topic/2456-sprint-lte-device-release-dates/