You can set up any Apple Watch with cellular for your child or family member, even if they don’t have their own iPhone. To do so, you must be the family organizer or parent/guardian in your Family Sharing group.
On watchOS 27, your child or family member must be part of your Family Sharing group and have a cellular-capable Apple Watch SE 3 or Apple Watch Series 9 or later. Their watch doesn’t have to use the same cellular carrier as the iPhone you manage it with, but the iPhone you use to pair and set up the watch must be within normal Bluetooth range (about 33 feet or 10 meters) of it to manage settings and update the software.
Apple Watch For Your Kids is not available in all countries or regions.
Tags: Family sharing, Setup