Yes, to make the most use of fixes and function, update your carrier version for use on T-Mobile.
Carrier settings updates let your carrier provider update carrier network and related settings to improve cellular network connectivity and performance or add support for features like VoLTE or Wi-Fi Calling. For more information on what is included in a carrier settings update, contact your carrier.
When a carrier setting update is available, you will be prompted to install it. If your carrier releases a mandatory update, you'll see an OK button instead of an Update button to let you know that the update was downloaded and installed.