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