TP Link Deco Mesh S4

You have an Arcadyan KVD21 5G gateway, the one T-Mobile is currently supplying to most T-Mobile Home Internet (TMHI) subscribers.

So it sounds like you're just trying to set-up your gateway for the first time. You should be using the TMHI app for setup. What you're watching on YouTube is most likely out-of-date.

There is very little you can do to configure the KVD21. It's actually designed to be pretty much plug-’n-play. If I were you, I'd start by noting my current SSID (WiFi name) and password so you can replicate it on the new gateway. That way your devices will log back on to your new network seamlessly.

For current videos and installation instructions, go to https://www.t-mobile.com/support/home-internet and it will walk you through how to set-up your new gateway. It is pretty simple.

I would caution you about one thing: gaming. A lot of users have problems with on-line gaming sites due to the limitations of the gateway. Just be aware that it could be a problem.

But first things first. Watch the videos and get your new network set-up.

Good luck!