If I don’t want to use my cellular from my iPhone can I use a separate cellular on my I watch?

Do you mean use a different cellular provider? or just a different cellular connection on your watch?

either way, at a minimum, you need to have a watch that supports cellular service - there are two options in the Apple Watch series... ones that support Cellular + GPS, and others that support GPS-only.

If your watch only supports GPS, then stop right there. There is nothing more you can do, other than have the watch piggy-back on the phone's cellular connection.

If your watch does support GPS, then you can get GPS service. Technically that does not have to be from the same provider as your phone, but practically you may want that since most providers provide a discount for accessories linked to a primary iPhone account, which may save you money.

For Apple Watch cellular, you have 3 options

• Share your iPhone's phone number and pay a $10 (U.S.) fee
• Or use Apple Watch Family Sharing and the Apple Watch is treaded as if it is a dependent child's Apple Watch, which limitations because it does not have its own iPhone to additional services.
• Do not activate the cellular and use it as if it was a GPS only Apple Watch

… but how… i have been trying to accomplish this for weeks without success. It’ll set up on the dedicated watch line only if i set up for a family member; when setting up for myself, it automatically wants to default to numbershare