Can you use other Smartwatches with iPhone?

Related questions

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2. Why is my watch not connecting to my phone?
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4. Are Tag Heuer watches good?
5. What is a Tag Heuer connected watch?
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Tags

1. #smartwatches
2. #provided
3. #watch
4. #apple
5. #iphone
6. #phone
7. #special
8. #software
9. #works
10. #google
11. #samsung