So currently I am going through the exact same problem. I have had the Samsung Galaxy watch since Dec. It has been working fine up until about 3 weeks ago. It fails to numbersync stating its unavailable. I have been in contact with my carrier (ATT) and have gone through 4 stages of tech support through AT&T. I have resetted my watch 3 times, my phone twice, have gotten 2 new e-sims and am still at square one. For 2 weeks I have been bounced around from tech support to tech support and the best thing I get is an "I understand your fustration" comment. I have a warranty on my watch and insurance. I was finally put through to Samsung and they told me they dont replace watches. They service them. I would need to send the watch to them with a turn around timeframe of 9 to 11 business days to decide what is the next step. This has been the most horrific example of customer service and support. So I have done everything on my end and been without the features of my watch for 3 weeks and is expected to be another 2 weeks without it. This is horrible. I am ready to ditch Samsung. Thank you Samsung for this experience.
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