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Learn about network settings on an iPhone running Apple iOS 15. 

 

APN & data 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. To ensure you have the correct settings, reset your network settings.

 

Manual network selection

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. You can manually select a network only in areas where T-Mobile does not own GSM spectrum.

  1. From the Home screen, tap Settings > Cellular.
  2. If you have an iPhone with an eSIM, tap the line you're making changes to.
  3. Tap Network Selection.
  4. Slide the Automatic slider to the off position to start scanning for networks.
  5. Select desired carrier.

 

Switch 2G / 4G / 5G

For iPhone 11 series or older: There is no option to switch between 2G, 3G, and 4G on iOS 15. You can only disable LTE.

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

  1. From the Home screen, tap Settings > Cellular > Cellular Data Options.
  2. If you're using Dual SIM, go to Settings > Cellular and choose the number whose options you want to change.
  3. Tap Voice & Data and choose how your iPhone uses the 5G network, which can affect battery life.
    • 5G Auto: Enables Smart Data mode. When 5G speeds don’t provide a noticeably better experience, your iPhone automatically switches to LTE, saving battery life.
    • 5G On: Always uses 5G network when it’s available. This might reduce battery life.
    • LTE: Uses only LTE network, even when 5G is available.

 

Data Mode

Changing data modes can change the way your phone uses our data network for all of your web-based applications. By default, Allow More Data on 5G is enabled. You can choose to change these settings, but battery life may be affected. 

  1. From the Home screen, tap Settings > Cellular > Cellular Data Options.
  2. If you're using Dual SIM, go to Settings > Cellular and choose the number whose options you want to change.
  3. Choose how your iPhone uses the data, which can affect battery life.
    • Allow More Data on 5G: Enables higher data-usage features for apps and system tasks. These include higher-quality FaceTime, high-definition content on Apple TV, Apple Music songs and videos, and iOS updates over cellular. This setting also allows third-party apps to use more cellular data for enhanced experiences. 
    • Standard: Allows automatic updates and background tasks on cellular, and uses standard quality settings for video and FaceTime. This is generally the default mode.
    • Low Data Mode: Helps reduce Wi-Fi and cellular-data usage by pausing automatic updates and background tasks.

 

Turn on / off airplane mode

Airplane mode turns off wireless connections. This allows app and menu use but prevents voice or Internet use.

  1. From any screen, access the Control Center:
    • iPhone X: Swipe down from the upper-right corner of the screen.
    • iPhone 8 and earlier: Slide your finger up from the bottom of the screen. If a small arrow appears, slide your finger up again.
  2. Tap the Airplane Mode icon.

 

Turn on / off data roaming

Follow these steps to turn off data roaming. If roaming in a Simple Global country with iOS 10, you must turn off mobile data to prevent data usage.

  1. From the Home screen, tap Settings > Cellular or Cellular Data.
  2. If you have an iPhone with an eSIM, tap the line you're making changes to.
  3. Tap Cellular Data Options.
  4. Drag the Data Roaming slider to OFF.

For iPhone 12 series with 5G: Carriers around the world are still working to deploy their 5G roaming support. If you turn on Data Roaming, you can get cellular data through 4G or LTE networks when you travel. You can also obtain a local SIM card or eSIM and use it as a single line with 5G where available.

 

Turn on / off mobile data

  1. From the Home screen, tap Settings > Cellular.
  2. If you have an iPhone with an eSIM, tap the line you're making changes to.
  3. Tap Cellular Data to turn on or off.

 

Turn on / off LTE

For iPhone 11 series or older

  1. From the Home screen, tap Settings > Cellular.
  2. If you have an iPhone with an eSIM, tap the line you're making changes to.
  3. Tap Cellular Data Options, then tap Enable LTE toggle.

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