Add 2 Voice lines, get a third line for free
For a limited time, customers with 1 paid Voice line on a qualified T-Mobile ONE plan can get a free Voice line when they activate 2 new Voice lines. New customers who add 2 Voice lines can get a third line for free!
Offer not available for existing customers who have more than 1 Voice line or customers on a 9+ plan after adding or activating new lines.