Financing Device Payouts

I’m wondering. If I finance a device. In this case pixel 9 pro 256gb. It’s $30 a month for 24 months. That’s with a discount applied.

If I pay off that total amount so $30x24=$720.00 upfront.

Do I own the device and can switch to BYOD plans? Or since it’s the discounted price I’m locked in for 2 years on the contract term?

I’ve always done save and return but looking at financing since I have a solid trade in for my device which would pay out the entirety of the $720. The device itself without discounts is like $1700.