*#*#4636#*#* isnt enough. it wasnt enough for me.
in the past.... *#197328640# would open all such options (ro.usually)which would (of course) depend on make/model/lock(network,SIM....yadayadayada).
if you are interested in more information on the subject. it really is a lot more than sec/ussd codes and sys.perso.sec.
but, you may have to get a different type of device entirely to see the typical LTE provisioning
the .apk i use is Secret Codes Revealer simply because in 2011 it was the only one out there with its function and im sure it was built in Russia due to.....and the Russian responses when it was maintained.