To disable the latest mobile network on your device, go to your phone's settings. Select the Network or Connections section and find the mobile network options. From here you can choose the network type and switch from the current mobile phone to the previous generation such as 4G or LTE. This process may vary slightly depending on your device model and functionality; so check your phone's manual for specific instructions. Not using a new cell phone can help extend battery life and increase network security in areas where the new network is limited or inconsistent.