In late 2018, Google Fi first offered a promotion for new subscribers - beckoning them with a free month of service.
The promo is back - for a limited time until March 24th, 2019.
This promotion is available to new subscribers only. You must port in a phone number and bring a compatible device.
Our Quick Take: Saving a total of ~$20 may not be worth the hassle. However, if you were looking to switch to Google Fi anyways, may as well save $20!
More info: Google Fi