T-Mobile: Free Voice Line (Existing Customers)

T-Mobile is offering a free voice line for existing customers! This is the 7th 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).

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T-Mobile Free Voice Line Offer

T-Mobile is offering a free voice line for existing postpaid customers with two or more lines. You must message T-Force on Twitter/Facebook to get the free line added. Promo is coded as ‘2023BYOD_P1’.

Eligible plans include:

  • Simple Choice Plans
  • Magenta
  • Magenta Max
  • T-Mobile One
  • Go5g
  • Go5g+

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!

T-Mobile "Get a FREE line" promotion
(Image from T-Mobile)


Existing T-Mobile Customers

As long as you have 2 paid voice lines on a qualifying plan and have been a customer for at least 12 months, 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
  • Go5g
  • Go5g+

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

  • Select Choice
  • Military
  • First Responder
  • 55+

Not sure what type of plan you have? Look up your plan details when you log on to your T-Mobile account. If it’s not clearly listed, you can find out the “SOC” code (service plan code) of your account with the directions below.

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 my.t-Mobile.com 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
(Image from Reddit)

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:

Trade-In Phone Offers

Currently on their website, T-Mobile is offering a free Samsung Galaxy S22 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
(Image from T-Mobile)

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

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
  • December 19, 2022
  • June 29, 2023

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.

About John Pham

John Pham is a personal finance expert, serial entrepreneur, and founder of The Money Ninja. He has also been fortunate enough to have appeared in the New York Times, Boston Globe, and U.S. News & World Report. John has a B.S. in Entrepreneurship and a Masters in Business Administration, both from the University of New Hampshire.

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3 years ago

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!