When Google launched its MVNO carrier known as Fi, it had one unconventional plan now known as Flexible. It allowed you to pay for your wireless service in an “a la carte” fashion, only buying what you need.
In 2019, Google Fi added a new plan to the line-up, known as Unlimited. With the Unlimited plan, you paid a flat $70 fee for your service, allowing you to avoid monitoring how much data you’re consuming. Now, Google is rolling out a second unlimited plan called Simply Unlimited. Meanwhile, the previous Unlimited plan has now become Unlimited Plus.
That brings three wholly separate plan options to Fi: Simply Unlimited, Unlimited Plus, and the original Flexible. With three different plans, Google Fi appears to be stepping further away from its original intentions to become a fairly traditional MVNO.
Jane Brown 
Mike Lee-111 