Starting September 25th, Google Fi will change the way it manages your Google One benefits if you're a Google Fi Wireless Unlimited Plus.

Unlimited Plus includes 100GB of cloud storage, and the MVNO allows subscribers to manage their Google One subscription directly through their Fi account page as well as mobile apps. This integrated experience will be available starting September 25.
In this context, the provider explains that “any upgrades to your Google One memberships will be charged to your Fi account.” Previously, this happened independently of the wireless service.
Starting with the next Fi pricing announcement on September 25th, if Fi members upgrade their Google One subscription beyond the 100GB already included, the increased subscription cost will be charged to your Fi account.
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However, such a change may trigger a misleading notification stating that your “Google One” subscription has been canceled. In today’s email , it states, “This is an automated message that you can ignore.”
Google One subscriptions will automatically renew, with no loss of storage or interruption .

If you opt out of the service, you will have a 7-day grace period. During this period, you will have the option to rejoin Google One without losing any services.
The company points out that there are no changes to the 100GB storage you get with Google One's Fi Unlimited Plus plan
Source: 9to5google.com
