Key Highlights
- The free line is strictly a “Bring Your Own Device” (BYOD) arrangement and typically requires having at least two paid lines on the account, although additional requirements also likely apply.
- You can check eligibility by asking support to look for the “Loyalty BYOD Dec 2025” segment (ID25079) on your T-Mobile account.
- T-Mobile frequently runs free line promos for its customers.
- If you missed the last free line promo, another one is now rolling out.
- However, the big catch with the promo is that customers are being selected randomly for the free line, presuming they fulfill some basic conditions.
