Google is now offering consumer cell phone services, through their wireless program called Fi.

The plans will start as low as $20, but there are some limitations, USAToday reports.

Starting at a base price of $20, Google's plans appear much cheaper than the major carriers. However, the $20 price does not include data. Data will cost $10 per gigabyte used, which could add up quickly if subscribers use a lot of data every month.

The plans will offer unlimited talk, unlimited text, Wi-Fi tethering and international coverage in more than 120 countries. Customers can choose the data plan based on how much data they think they will use each month. If they sign up for the $20 2 GB data plan and only use 1 GB in a month, they will be given a $10 bill credit.

An advantage to Google's Fi is the fact that it will not require users to sign contracts. 

One major limitation with Fi is that Google is only offering the service on its own Google Nexus 6 phone. Other smartphones will not be able to access the service.

The Fi service will use T-Mobile and Sprint infrastructure to offer cellular service to its customers. Google Fi will use Wi-Fi networks to route calls and data and that is expected to keep costs down and make it possible to offer low prices to customers.

Google is calling the project an opportunity to introduce "new ideas through a fast and easy wireless experience" and "to push the boundaries of what's possible." 

In their official blog announcing Fi, Google explains that as customers move around Fi will follow them and offer them the best, fastest connection based on their location. As customers move around, Fi will first attempt to connect them to secure and free Wi-Fi hotspots. When not on a Wi-Fi connection, Fi will locate the fastest 4G LTE partner network based on the customer's location.

Before signing up for Fi, customers will have to ensure it is available in their area. Then, they will have to request an invite. 

Currently, the coverage map appears awfully spotty for places that will offer Google Fi. The program plans to be available in more U.S. cities soon.