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The cellular back up option is provided through T-Mobile. Details here: https://nest.com/support/article/How-to-purchase-or-cancel-cellular-backup-for-Nest-Secure
Sorry, there was a problem. Please try again later.I'm unsure which LTE provider they use but I do know that it's Brinks Home Security that monitors the system. They do not give you any options as to who the provider is for service, only that they give you the option to subscribe or not. The LTE card is already within the Nest Alarm unit when you buy it, they just turn it ON and OFF.
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