In case you didn’t know, your Samsung Galaxy S9 and Galaxy S9 Plus can use different types of Internet connection. Out of all the available options, the LTE–also known as the 4G network–is the most reliable and fastest mobile network. Usually.
Since the purpose of your phone is to give you the best possible experience, your phone will constantly search for the LTE network. This is useful if the LTE network is available. But if you’re not in range of it, for whatever reason (for example, you could be in a building that blocks LTE reception, or somewhere remote that the network doesn’t reach), having your phone constantly check to see if the network is there will use up your battery and generally make life harder. (Check this article  out if you need to keep better track of your S9’s battery.) If you’re not in a place where the LTE network is reliable, or if you want to connect to a slower network, you may want to force your phone to stop trying to connect to LTE,
If you prefer to connect to your 3G mobile network because you find more accessible, then this article will help you disable the default connection on your LTE network.
How to Switch Off LTE on Samsung Galaxy S9 and Galaxy S9 Plus
- Switch on your Samsung Galaxy S9.
- Navigate to your Home screen.
- Then swipe down from the top of your screen to open the Notifications.
- Tap the icon that looks like a gear to open Settings.
- Go to Connections.
- Tap Mobile Networks.
- Tap Network Mode.
- Choose the level of service you want your phone to try to connect to:
- 2G only.
- 3G only.
- 2G / 3G (automatically).
- 2G / 3G / LTE (automatically) – this is the option you probably already have selected.
- Tap on the option you want, then exit the menu.
Any of the options above under Network mode that don’t involve the LTE network should be good connections–just slower. What you want will depend on what network you prefer and what you need to use at the moment.
When you’re back in range of the LTE network, you can navigate back to the Network Mode menu and choose an option that includes LTE. In the mean time, your phone won’t waste its battery looking for a connection that isn’t reliable.
Keep in mind that 2G network corresponds to GSM mode. The 2G / 3G (automatically) network is probably one of the best networks to use because it gives you a decent speed on the Internet and great network coverage. With this option, your Galaxy S9 and Galaxy S9 Plus will now work smoother using the 2G or 3G network.