Picking a watch
I’m trying to pick a watch that I can take phone calls on etc and not have my phone close to me ( whilst at work) which one would you suggest is best
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All watches can take calls.
All watches can take calls when away from the iPhone as long as they are connected to Wi-Fi.
If you want to take calls when away from the paired iPhone and away from a Wi-Fi network, then you'll need a GPS+Cellular model.
Beyond that the voice comes down to how much you want to spend on the watch. The Series 6 has the ECG and Blood Oxygen apps which aren't available on the SE or Series 3.
See here for a comparison between the currently available models: link-> https://www.apple.com/watch/compare/