Google made their initial $20 sign-up bonus for new Project Fi subscribers available permanently. $20 will be credited after being active for 30 days. Use this link or enter promotion code "77D194" to sign up. The Project Fi mobile plan from Google is our favorite plan to use for traveling around the world.
If you aren't sure if Project Fi is the right plan for you look at our side by side comparison of T-Mobile and Google Project Fi.