I've been wondering if you could use a cellular Apple watch like a dumbphone, initially setting it up with a friend/family member's iPhone (restored to get a fr

I've been wondering if you could use a cellular Apple watch like a dumbphone, initially setting it up with a friend/family member's iPhone (restored to get a fresh account, swap SIM and set up watch, then restored back to their backup), and then only using time/alarms and phone. Anyone know if that's possible? Could you update the contacts via icloud.com? Install software updates without an iPhone or Mac/Windows?