blog post revealing the details of its much anticipated prepaid mobile phone service. Called Project Fi, it's a mobile virtual network operator or MVNO that uses both the T-Mobile and Sprint networks as well as WiFi for calls, messaging and data.
Project Fi requires a Nexus 6 phone with special Project Fi software that routes calls, texts and data over the best available network whether its Sprint, T-Mobile or WiFi.
Google has verified over a million WiFi hotspts that it has verified as fast, reliable and safe. Project Fi phones connect to these hotspots automatically. When using WiFi, Project Fi creates an encrypted connection. Handoffs from WiFi to cellular are supposed to be seamless.
Project Fi costs $20/month for unlimited domestic voice and unlimited domestic and international texting. Cellular data is available in 1 GB increments priced at $10 per GB. If you don't use up all your data Google will give you a credit for the the unused amount. So if you buy 2 GB and only use 1.2 GB you get an $8 credit toward the next month's payment.
WiFi hotspot tethering is included at no extra cost. International roaming is available in 120 countries. Data while roaming costs the same $10/GB as data in the US but is throttled to 256 Kbps. Texts are free while roaming internationally and calls are 20¢/minute.
Account management is provided by a Project Fi app that lets users change plans, pay their bill and check data usage. Google will provide 24/7 phone support for Project Fi customers. Project Fi numbers are Google Voice/Hangouts numbers so users can make and receive calls, texts and MMS on any phone, tablet or PC that supports Hangouts and has an internet connection.
Project Fi is available on an invite-only basis. Click here to request an invite.