After months of experimenting with a select cadre of invitees, Google has finally opened its Project Fi mobile service to all takers.

In a blog post earlier this week, Google said it is removing the invitation-only restriction on the service and will allow consumers across the United States to sign up.

Announced in April 2015, Project Fi is a hybrid mobile service that jumps back and forth between Wi-Fi and LTE signals from Sprint and T-Mobile, depending on which is the strongest in the vicinity.

In order to encourage more customers to jump on board, Google said it will offer the 16 GB Nexus 5X smartphone for $199 for the next month. The device was introduced in September for $490 but was reduced to $349 in January.

Project Fi offers service, including unlimited domestic talk and text and unlimited international texts for $20 per month. On top of that customers pay $10 per GB of data they use each month. Unused data is credited to the customer at the end of the month.

Google said the Project Fi service is supported in more than 120 countries around the globe and is available on non-phone devices like tablets and cars through the use of a data-only SIM card. Data usage rates for customers who use their devices abroad are the same as those charged for usage in the U.S., Google said.