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These are great questions! The LTE version of the Galaxy Watch3 is compatible with the Galaxy S7. If you purchase the LTE version and want to use the watch without having your mobile device, you will have to purchase a data plan. Thank you for asking this question. ^Kayla
Sorry, there was a problem. Please try again later.I believe it will work fine with your S7 phone as i am using a S8 with it and you dont need a subscription to use it as it connects through your phone, you can leave your phone at home and go shopping and use it just like your cell phone.
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