Originally Posted by mklbndl
Is there a way to enter the service mode main menu in Note 3 where you can tap UMTS like in Galaxy S4?
from your dialer, enter *#2263#
Enabling a specific frequency will not enable it on your device if Samsung has crippled it for your specific carrier. The only way to enable another modem frequency is to flash a supported ROM for your model and enable the ROM through the carrier settings.
Hope this helps!