For a limited time, T-Mobile is offering its existing single-line or new customers an additional 3rd line for FREE via bill credits (limit 1 offer per account).
Please note that if you are an existing customer, you will need to have qualifying credit and be part of the Essentials, Magenta, or Magenta Plus plan. Credits may take up to two bill cycles and will stop if you cancel any lines. If you are a new customer, you will need to activate two voice lines and the 3rd will be FREE!
See more online and retail deals HERE!