2019 Spring Third Line On Us

-Offer no longer available-

For a limited time, customers with 1 paid Voice line on a qualified T-Mobile ONE plan with AutoPay who add a Voice line can get a third line for free after bill credits. New customers who activate 2 Voice lines can get a third line for free after bill credits!



Get this deal


When is this deal available?

March 6 - 31, 2019

Where can I get this deal?

This offer is no longer available.

What do I need to do?
New customers
  • Activate 3 new qualifying voice lines on a qualifying T-Mobile ONE plan during the promo period.


Existing customers

  • Have 1 postpaid Voice line of service.
  • Have or switch to a qualifying T-Mobile ONE plan.
  • Activate two new qualifying voice lines during the promo period.
Get your credit

You'll receive text message confirmation once you're qualified for the deal, and your monthly credits will begin within two bill cycles after purchase. The credit will apply to the line with lowest monthly recurring charge activated during the promo period after all other discounts.


If you don't see a credit on your first bill, you'll see a double or make up credit on your second bill. Learn more about Promotional credits.

Anything else I should know?
  • You must keep your account in good standing with the lines active to receive your credit.
  • For 1 year, you must maintain the same number of lines that are on your account when the promotion starts. If you cancel any line on your account within 1 year, you will lose your credit.
  • After 1 year, you must keep two paid T-Mobile ONE voice lines and the lines activated during the promotional period to keep your credit.
  • Limit of 1 redemption (1 free voice line) per account
  • If you're an existing customer who canceled a line within the last 90 days, you’re not eligible for this promotion. However, you can restore a recently canceled single-line account and add an additional line to participate.
  • Credit for voice lines applies to basic plan charge; Any line add-ons will be your responsibility to pay (such as ONE Plus).
  • Some T-Mobile ONE plans like 2 lines for $100 plans, T-Mobile ONE Unlimited 55+ plans, T-Mobile ONE 9+ lines, T-Mobile ONE Amplified, T-Mobile ONE Military plans, and T-Mobile Essentials do not qualify for this deal.



Get help with this deal

Not seeing your credits on your account? No worries! We got you covered. It can take up to 2 bills before your credits apply to your account. If you're still not seeing your credits or received a notification from us that you're no longer eligible for this deal, check out Promotional credits for help.