I tried to activate my apple watch with a different carrier than my iPhone. Apple watch kept saying not able to connect to the carrier when I tried to setup the cellular for the watch.
Apple Watch Series 6, watchOS 10
The Apple Watch ONLY uses a separate phone number and a different carrier if it is a dependent child’s or aging parent’s Apple Watch.
In this mode, it is limited In features, plus it costs more for the second cellular plan.
Set up Apple Watch for a family member - Apple Support
The typical way an Apple Watch pairs with an iPhone is by sharing the same phone number. For this service the iPhone carrier charges a monthly fee of about $10 U.S. Here is a list of carriers that support the Apple Watch
Apple Watch - Carriers - Apple
The Apple Watch ONLY uses a separate phone number and a different carrier if it is a dependent child’s or aging parent’s Apple Watch.
In this mode, it is limited In features, plus it costs more for the second cellular plan.
Set up Apple Watch for a family member - Apple Support
The typical way an Apple Watch pairs with an iPhone is by sharing the same phone number. For this service the iPhone carrier charges a monthly fee of about $10 U.S. Here is a list of carriers that support the Apple Watch
Apple Watch - Carriers - Apple
How to setup apple watch when iphone is with a different carrier
