You can configure Network Mode on this page.
Network Mode - The device supports three modes of network connection - 4G Preferred, 4G Only, and 3G Only. if your SIM card supports WCDMA, select 3G only; if your SIM card supports FDD-LTE, select 4G Preferred or 4G only as you need.
Network Search - The device provides two types of network connection - Auto and Manual. Please select the connection mode as you need.
Click Save to save your settings.