Learn about cellular backup for Nest Secure - Google

News
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" Cellular backup subscriptions purchased directly from Nest will be supported through August 30, 2020. After August 19, 2019, you will only be able to purchase cellular backup through one of our partners."

https://support.google.com/googlenest/answer/9241359?co=GENIE.Platform%3DAndroid&hl=en

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It wouldn’t surprise me if they don’t change somthing like this with ring but since amazon owns ring they could include it in ur prime membership