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Thanks for reaching out to inquire about the Galaxy Watch6. We always look forward to assisting our valued customers. The Watch6 requires a Samsung Galaxy Smartphone with Android 9.0 or later, and a Samsung Health Monitor app (available only at the Samsung Galaxy app store). In short, this watch should work with your S21. For any further questions, please reach out to us at Support. -Kelvin
Sorry, there was a problem. Please try again later.It should be compatible, I'm currently using the s23 FE and I've had no problems, you can't facetime as it has no camera but calling and speaking through the mic works
Sorry, there was a problem. Please try again later.
