From a Home screen, navigate: Apps > Settings. These instructions apply to Standard mode only.
From the Wireless and networks section, tap More networks.
Tap Mobile networks.
Tap Network mode.
Tap the appropriate setting:
Global
This is the preferred setting for most locations.
LTE/CDMA
This setting should only be selected if experiencing service issues in locations that offer multiple network types and only LTE/CDMA is needed.
GSM/UMTS
This setting should only be selected if experiencing service issues in locations that offer multiple network types and only GSM/UMTS is needed. The preferred international carrier is automatically selected. You can manually select an alternate carrier but it may require as many as 6 registration attempts with that carrier prior to successful registration.