Can I use both Apple Watch Ultra 1 and Ultra 2 together?
Can both watches be run at the same time including receiving calls when not near my phone?
[Re-Titled by Moderator]
iPhone 15 Pro Max, iOS 18
Question marked as
You can pair more than one Apple Watch to your iPhone, but not all carriers support multiple, active cellular plans at the same time. Contact your carrier for details.
Have a look at the related articles:
Use more than one Apple Watch with your iPhone - Apple Support