Dialing*#*#4636#*#* or *#36446337#: In both modes you should access Networks and set a Preffered Mode from the menu to LTE only (or whichever mode your prefer at that time).
Dialing*#*#4636#*#* or *#36446337#: In both modes you should access Networks and set a Preffered Mode from the menu to LTE only (or whichever mode your prefer at that time).