T-Mobile unveils new 2020 Line On Us 4 promotion


Over the weekend, T-Mobile launched a new promotion called “2020 Line On Us 4”. This promotion follows the 2020 Line On Us 3 offer that the wireless carrier launched in November. 

The new promotion comes in the form of complimentary voice lines for both new and existing subscribers. The offer is exclusive for those with at least two paid lines of service and will add a third line. The third line can be added at no cost and without the need to meet other special requirements by T-Mo. 

There is a required plan activation under certain plans. This, however, has not yet been disclosed. You will simply need to add a line to your account like you normally would. The promotion will automatically be applied to your account on the next billing cycle, as long as you keep the plan active. You may require the assistance of a T-Mobile representative if you need to do a plan change. 

The best part about this offer is that it is stackable with the other T-Mobile offers that are still available. But the offer cannot be stacked with the following offers that T-Mo is currently running:

  • iPhone 12 “on us”
  • BOGO iPhone
  • Free Samsung Galaxy A71 5G with new line
  • Free OnePlus 8 or OnePlus 8T+ 5G with new line
  • TFB-exclusive promos
  • BYOD promos from Costco

There also seems to be some asking if a 9th line can be added under a plan. The best answer to this is that the offer will move you to the 9-12 line version of your plan. If you have a grandfathered plan, however, you won’t be able to get the offer.

In order to keep enjoying the free line, you need to maintain good standing on all your paid lines for 12 months. After that period, you can decide to remove the paid line.

If you are interested in learning more about this promotion, you can visit this Reddit thread for some answers to commonly asked questions. The Reddit thread contains an eligible SOC list so you can determine if your current plan is qualified for this promotion. 


Sources: 1, 2

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  • g2a5b0e

    It’s funny how so many people here complain when deals aren’t offered to existing customers, but they have nothing to say when they are. How about you bring that same energy on the positive side too?

    • dontsh00tmesanta

      Why would they need to say anything when they are offered to existing users? You wanna see posts saying bout time etc?

      • g2a5b0e

        You didn’t understand my point if you have to ask that question. You’re thinking negatively like so many others. My point is if you can complain when you don’t get what you want, then you should praise or thank when you do. Saying “about time” still sounds like complaining.

        • dontsh00tmesanta

          Now you’re mad you don’t see any?

        • g2a5b0e

          What makes you think I’m mad? Simply making an observation.

        • Charmed79

          So your argument is this… you are complaining about people complaining lol gotta love it. Maybe you should practice that whole positivity you are talking about!

        • g2a5b0e

          Not a complaint, simply an observation & a request. It’s unfortunate that you can’t tell the difference.

    • dcmanryan

      It’s the old saying you can treat 99% of your customers like gold but the 1% kills you. People complain much more than they praise I guess is what I’m getting at it. We all see it daily at work, the news etc. as bad news always gets more attention.

      This thread is surprisingly quite dead and I hope those who have not been with T-Mobile very long realize giving out 4 lines in 6 months is unheard of. My own opinion is this is a subscriber and numbers game and no one will ever convince me otherwise so take advantage people if you can and while you can rather you need it or not as this will end eventually and you can always give the line away or charge someone for it. Unfortunately I missed the last one and this one as I can’t go above 8 lines or I’ll lose my hookup code for 20% off for life. Life of the plan you’re on for those who didn’t know that. Switch plans and it’s gone unless you find the right rep which I haven’t.

  • TheTruthIsOutThere

    No real details in this article…

    Referring to Reddit is sad as that isn’t a vetted news source.

    • riverhorse

      What? Real TMO employees man TMO Reddit thread.

  • Joe

    I just tried to get it. Same thing as always your on the best discounted plan you don’t qualify. lol

    • KOLIO

      Which discounted plan are you on?

      I’m probably in the same boat as you, I have a Military One account & haven’t been able to get a free line on it since switching over from a Magenta One account about a year or so ago.

      • Joe

        I’m on the Amplified Plan.

      • Alex Pilaia

        3 lines Unlimited All In Promo for $100… do not qualify… as usual..

      • MachoMachoMan007

        Koloa, I’m on the same plan as you. SOC is TMSERVE9, but I never qualify for any of the free AALs either. I’ve asking if switching to the Magenta Military plan would qualify and they tell me no. Don’t get me wrong, the military discount is really neat, but they should cap us at 2 free lines or so. People in this thread have half a dozen free lines!

        Let me know if you’re able to get this one somehow please!

        • KOLIO

          Just called today & unfortunately, the Military One plan is excluded from this free line promotion. I suspect the 1st Responders plan is as well, as it’s different in name only from the Military One plan(s).

    • jimjwilliamson

      Right? guy above here with 6 free lines.. but because we’re military, or prior service, no love..

  • Aaron A.

    Added my 6th free line yesterday. I have 2 paid lines and 6 free lines $120/month.. T-Mobile doesn’t want us to leave them for another carrier that’s why they are offering free lines LOL. Tmonews is late to report this news.

  • marque2

    Can you stack it with the one plus 8. It says the phone is free if you add a new line – Never mind, read the article more closely, you cant

  • Kirk Lange

    Just added the free line for my son’s first phone. It can be combined with the 50% off Pixel 4a. So great deal there!

  • Nobody Special

    This was misleading: There also seems to be some asking if a 9th line can be added under a plan. The best answer to this is that the offer will move you to the 9-12 line version of your plan. If you have a grandfathered plan, however, you won’t be able to get the offer.

    I have 2 lines on a promotional (simple choice) grandfathered plan, with 6 free phone lines that are also grandfathered totalling 8 voice lines. So based on the paragraph above I am not eligible for the free line because it will put me in the 9-12 line version of my grandfathered plan. Well actually I contacted T-Mobile customer service and they stated I am eligible for the free line despite what this article says.

    SO now I have 9 unlimited voice lines for $100 + taxes/fees. (Thank T-Mobile)

    • disqus_u9AdYVGMfZ

      Can you take a screenshot of ur promotion please.

    • dcmanryan

      You better watch your account like a hawk because a regular phone rep can’t do what you described without getting a supervisor involved. Trust me, I’ve dealt with this before.

  • krisstofer

    So what can you combine with the free line only the Pixel 4a 5G for 50% off?

  • Eddie Vazquez

    I am a new Tmo customer. The free line is only voice (calls) only and no data?
    Thanks in advance for the anwers.

  • Mike McDonald

    Anyone notice Alex Wagner is no longer on the masthead? He must have sold Phonedog Media.