Locking the Telkomsel network on a Redmi phone can help improve network stability and prevent unwanted switching between 4G, 3G, and 2G. This is typically achieved through the phone's settings menu, allowing you to manually select the preferred network type. This can lead to a more consistent data connection. Consult your Redmi phone's manual for the specific steps, as the exact process can vary depending on the Android version and MIUI skin.