You can do this by typing the special code every time but I suggest making a contact with the first name "Z" last name "Hidden Menus" and the dialer code as the phone number. Then all you have to do is dial *#1 and the contact pops up like shown below
Goto your dialer, enter *#147852#
Wait a moment. A box will come up and say "Complete Action Using" and you scroll down to "LTE Functionality Test"
You'll see the "LTE TEST" menu and when you click "Turn OFF" and "Turn ON"
The dialer code used, *#147852#, also gives access to MANY hidden menus. At this point I WOULD ADVISE AGAINST CLICKING ANYTHING ELSE. In my testing I found a few destructive options including some that could erase settings needing a factory reset.
Donate to the "Buy my girlfriend a fancy dinner for ignoring her the past few weeks" fund
Goto your dialer, enter *#147852#
Wait a moment. A box will come up and say "Complete Action Using" and you scroll down to "LTE Functionality Test"
You'll see the "LTE TEST" menu and when you click "Turn OFF" and "Turn ON"
The dialer code used, *#147852#, also gives access to MANY hidden menus. At this point I WOULD ADVISE AGAINST CLICKING ANYTHING ELSE. In my testing I found a few destructive options including some that could erase settings needing a factory reset.
Donate to the "Buy my girlfriend a fancy dinner for ignoring her the past few weeks" fund
post edited