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T-Mobile: Free Voice Line (New & Existing Customers)

T-Mobile is offering a free voice line for both new and existing customers! This is the 6th time T-Mobile has offered this deal. The free line is available on most plans, but there are some that’s excluded (more details on that below).

This latest offer will start on March 17 so I’ll update this post as more details come in.

T-Mobile Free Voice Line Offer

Similar to a deal Sprint customers are getting, T-Mobile is offering new and existing customers a free voice line! The deal will go live starting on March 17, 2021 in stores and online.

This is absolutely bananas. Personally, I now have 10 voice lines, but only paying for 2 of them. The rest were free from these T-Mobile free line promos!

Ninja Update 3/17/21: Website is not showing promotion, but it’s active. If you add a line online, it will be free provided you have an eligible plan listed below. If you’re not comfortable with this, customers will be able to get a free voice line in store or via T-Force (T-Force is T-Mobile’s social media team on Twitter). You can also call 1-800-937-8997 or text 611 and reference “2021 Line On Us P6”.

T-Mobile "Get a FREE line" promotion


New T-Mobile Customers

New T-Mobile customers that activate 2 voice lines will get another voice line for free.

Existing T-Mobile Customers

As long as you have 2 paid voice lines on a qualifying plan, you’re eligible to add another voice line for free.

What’s a voice line?

T-Mobile, like other carriers, offers different types of lines:

  • Voice lines: phone with a number and an associated mobile data plan (this is what this promo offers – you’re adding a line to your account that gets the same features of your account plan)
  • Mobile Internet lines: tablets and hotspots used for internet (no phone number associated with the service)
  • Wearable lines: smart watches with data capabilities (no phone number associated with the service)

The other stipulation is if you’ve canceled a line in your account in the past 90 days, you won’t be eligible.

Qualifying Plans

Generally, these are the qualifying T-Mobile plans that’s eligible for this free line promo:

  • Simple Choice
  • Magenta
  • Magenta Plus
  • Magenta Amplified Family Plan
  • Essentials
  • One
  • One Plus
  • One Amplified Family Plan

The discounted plans below don’t qualify for this offer:

  • Select Choice
  • Military
  • First Responder
  • 55+

Now, I did say those are generally the plans that qualify and don’t qualify.

To make a long story short, each T-Mobile account has a specific plan code, called a SOC Code. You need to see if your specific SOC Code matches one from this list. If it does, then your plan is 100% eligible for this promotion.

How To Find Your T-Mobile SOC Code

  1. Open the Developer tools panel on the right (Ctrl+Shift+I) on Chrome
  2. Click on Network tab
  3. Click on XHR tab
  4. Log in and click Account at the top.
  5. In developer tools panel, choose manageaccount from the list on the left
  6. Rate plan appears under ratePlans
T-Mobile SOC Code using Developer Tools panel

Stackable With Other T-Mobile Deals

What makes this free voice line a very hot deal is the fact that you’re able to combine this with other T-Mobile phone offers! For example, you can stack this with current phone deals like:

Free Phone Offers

Don’t want to pay for phone? There are free phones available when you add a line (which you’re already doing for free with this deal), like the Samsung Galaxy A11, Motorola moto g play, and LG K51.

Trade-In Phone Offers

Currently on their web site, T-Mobile is offering a free Samsung Galaxy S21 through billing credits when trading in select phones.

50% Phone Deals

T-Mobile also has a limited-time offer of 50% off an Apple iPhone 11 when you add a line.

The strategy for them here is to get additional revenue through your monthly service to offset the money they lost from giving you an iPhone for half its retail price. Well, with the free voice line deal, you’re making out big.

You’re adding the line free and getting an expensive iPhone model for 50% off!

T-Mobile 50% off iPhone XS promotion

Not an iPhone person? Other phones you can get 50% off include models like the LG Velvet 5G.

Ninja Note 12/20/20: This free line deal will not stack with the following phone promotions:

  • N/A (for the March 17, 2021 free line deal, all phone offers are valid)

Do not attempt to get one of the ineligible phone promos with the free line. The system will default to giving you the phone promo instead of the free line and you’ll be stuck with a regular paid line. To clarify, if you purchase a phone on EIP on the free line that would normally qualify you for a phone promo listed above, it will force the phone promo over the free line. This basically prevents you from adding any of the phones above to the free line.

$250 Bring Your Own Device (BYOD) Deals

This one is aimed specifically for Verizon and AT&T subscribers. If you port your number and use your existing phone, T-Mobile will pay you an additional $250!

Technically, you don’t even need to be a Verizon or AT&T customer either. As long as you have a phone you currently don’t use with T-Mobile, you can basically buy a Verizon/AT&T number to port in.

The latest promo code for this is “2020BYOD1” (valid between 9/18/20 – 10/1/20). For more details, you can check our post on this.

The Bottom Line

This is an extremely rare no-stipulation free line (like the free line offered back in 2016), although it does appear that T-Mobile is offering this quite a bit in the past 12 months. The dates below show all the times that this free line promo became available:

  • June 26, 2020
  • September 18, 2020
  • December 20, 2020
  • March 17, 2021

There have been promotions like this in the past, but T-Mobile usually requires existing customers to add a new paid voice line in order to get one free. This offer is much more generous. It is truly free if you are eligible. Keep in mind you still need to pay government-imposed taxes on the free line, but it only comes out to a few dollars a month.

There’s a great FAQ of this deal on Reddit if you want to see more information on how others are taking advantage of this deal.

1 thought on “T-Mobile: Free Voice Line (New & Existing Customers)”

  1. Jumped on this deal and got the $100 port a line rebate from buying an ATT sim card on ebay. Rebate status shows processing. Thanks TMN!


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