Can I pair 2 Apple phone with 1 Apple Watch ?

To clarify, as Froxo points out in this thread can I pair different I phones with different sim card from the same provider but operating in Asia and in Europe with the same Apple Watch 3 series? the only way you can do this is to unpair from the first phone and pair to the second when you want to switch phones. That's allowed, but hard work and time consuming.

Only one device can be paired to the watch at one time.