Hi there 👋, and warm welcome, I'm guessing you getting you 1st smartwatch, and want to keep your phone number, if your galaxy watch 6 is bought from same network as your phone you can its usually paired plan whitch means your phone number will remain same on your phone, but it will be different phone number on your contract (if this is the case) but when you will pair it with your device it will be the same phone number linked alongside with your original phones number, personally I don't leave my phone as far so I need to use my watches data to receive calls or messages I use Bluetooth so it uses my phones data since I never leave my phone from outside Bluetooth range from my phone.