T-Mobile's been disrupting the wireless industry in the United States for years now, and a result of this has been big savings for the Un-carrier's subscribers. T-Mobile often runs all sorts of deals and promotions at any given time, and these are the absolute best ones that you should keep your eye on.

Buy a Galaxy S9 or Note 8, get one for free

The Galaxy S9 and Note 8 are still two of the best Android phones you can get, and if you're on T-Mobile, there's never been a better time to pick them up.

For a limited time, buying an S9 or Note 9 will allow you to get another one completely free via 24 monthly bill credits.

You will need to add a new line of service in order to be eligible for this deal, but even so, you're still looking at some huge savings.

See at T-Mobile (opens in new tab)

Get one Galaxy Note 9 and take $720 off a second one

If you'd prefer to have Samsung's latest and greatest — the Galaxy Note 9 — T-Mobile's got you covered, too.

Right now, the Un-Carrier is offering a $720 credit off a second Note 9 when you buy your first one at full price. That credit is paid via a monthly bill credit and you'll need to add a new line to take advantage of this.

That $720 credit won't completely cover the second Note 9's cost, but with a full retail price of $870 at T-Mobile, it does take a big chunk out o fit.

See at T-Mobile (opens in new tab)

Take $30 - $50 off select Ultimate Ears speakers

You can never have too many Bluetooth speakers, especially if they're from Ultimate Ears. The UE Wonderboom and Blast are two excellent options that can really get the music pumping, and for a limit time, T-Mobile's taking $30 and $50 off, respectively.

This brings the Wonderboom down to just $69 and the Blast to $129. You can finance the speakers for a few bucks each month, or just buy them outright.

Also, since these are just accessories, you don't have to be a T-Mobile customer in order to take advantage of these savings. Nice!

See at T-Mobile (opens in new tab)

Buy the LG G7 and get up to $750 back

Samsung phones are great, but if you prefer LG, you can still save big. Specifically, T-Mobile's offering its subscribers $750 back on a second LG phone after you purchase a new LG G7 ThinQ.

Like all of T-Mobile's other promotions, that credit is offered via 24 monthly bill credits. However, you don't need to add a new line of service.

You can put that $750 towards another G7 and essentially get it for free, or settle for the V30, G6, or Stylo 4.

See at T-Mobile (opens in new tab)

Updated September 2018: Refreshed this guide with new deals for the Note 9, LG G7, and more!