My current T-Mobile plan is eligible for an additional free line. What's the process to add it to my account?

To add a free line to your T-Mobile account, you'll need to follow a specific process during a T-Mobile Free Line campaign which happens rarely and at random times. When it does, you should consider the following:

Make sure you meet the eligibility requirements for the T-Mobile Free Line campaign. In the last campaign that happened in March 2023, the requirements included having at least 2 paid voice lines on your account, as well as the new line being a specific plan.

While the additional line itself is free, there may be associated costs. In the past, there was a $35 line activation fee, and the new line might not be eligible for any free phone promotions. Be aware of these potential charges.

Once the free line is added, monitor your monthly bill to ensure that the appropriate credits are applied. T-Mobile typically provides the free line through monthly bill credits.

Please note that the specific rules and eligibility criteria for T-Mobile's Free Line campaigns may change from one campaign to another. It's essential to check T-Mobile's official website or contact T-Force for the most up-to-date information and to confirm your eligibility before adding the free line to your account.