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5G On: Always uses 5G network when it’s available.

When 5G speeds don’t provide a noticeably better experience, your iPhone automatically switches to LTE, saving battery life.

Tap Voice & Data and choose how your iPhone uses the 5G network, which can affect battery life.

If you're using Dual SIM, go to Settings > Cellular and choose the number whose options you want to change.

From the Home screen, tap Settings > Cellular > Cellular Data Options.

You can customize these options for when to use 5G and how much data to use in some apps. You can only disable LTE.įor iPhone 12 series with 5G: The default settings for 5G on iPhone are optimized for battery life and data usage based on your data plan.

Slide the Automatic slider to the off position to start scanning for networks.įor iPhone 11 series or older: There is no option to switch between 2G, 3G, and 4G on iOS 14.If you have an iPhone with an eSIM, tap the line you're making changes to.From the Home screen, tap Settings > Cellular (iPhone) or Cellular Data (iPad).You can manually select a network only in areas where T-Mobile does not own GSM spectrum. The device detects and registers on wireless networks inside T-Mobile’s calling area, but roaming networks are usually restricted to T-Mobile SIM cards. To ensure you have the correct settings, reset your network settings. These settings are automatically set to the correct values with the Carrier Update when a T-Mobile SIM is inserted and cannot be changed.