How can I change the network type?

Insert the SIM card, go to "Settings" > "Network & Internet" > "Mobile network" > "Preferred network type" to select a network type.

Set the network type to "2G" in urban or rural areas with poor 3G or 4G signal coverage can resolve failures such as call drops and intermittences caused by the switchover among 3G, 4G land 2G signals.