Kyocera DuraForce PRO with Sapphire Shield - Network Mode Settings
From a Home screen, navigate: Apps icon > Settings > More (Wireless & networks section).
Tap Cellular networks.
Tap Network mode.
Tap the Preferred network type:
When LTE/GSM/UMTS is selected, if presented:
Tap Network operators.
Tap one of the following options:
When selecting Manual, tap the preferred network.
The preferred global carrier is automatically selected. You can manually select an alternate carrier but it may require as many as six registration attempts with that carrier prior to successful registration.