I have the exact same problem with my Galaxy Watch 6 Classic LTE also on Google Fi. I complained to their tech support, which was a waste of time. Both Samsung & Google Fi say on their websites that no phone is needed for the Galaxy LTE watches to send and receive texts, but then in a following paragraph, it's stated that standalone texting by the watches, may not work. It's unbelievable that you pay extra for LTE, and it may not work as expected, and their customers are supposed to just accept this. No one has explained to me why this is or if anything can be done about it.
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