Make sure that you have an authentic Samsung S Pen. There are many aftermarket ones that look the same, but do not have the Bluetooth ability the legitimate S Pens seems to need. I just had to replace my lost Tab S7 S Pen and noticed many low cost replacements listed on ebay and Amazon, but I saw the complaints about them. Ordered an authentic Samsung S Pen new in box, and it connected to my Tab S7 as soon as it had the teeniest charge.
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The newest watches, Watch 4s, work on a different operating system. UP until Watch 4, Tizen was the operating system. Now the Watch 4 is WearOS based.
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Samsung can't turn on certain features in certain countries, because each health agency/authority has to approve the ECG, B/P, SPO2 sensors. They are considered medical devices.
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I like my very worn pink 20mm leather band...I wondered the same, that Samsung would or would not want this gnarly thing back. I have a rose gold RoadID on mine, and it would fit my new Watch 4 whenever it arrives.
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This time, all versions of the Watch 4 use 20mm watch bands. Any 20mm Quick Change watch bands, whether from Samsung or any other supplier.
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G-app developer contact is trupici.sk@gmail.com. Ask him to make the watch face component of his app also work with Wear OS 3. Dexcon itself has this information. https://www.dexcom.com/wear-os-google.
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