On 3-5-2020 go to the Samsung app register phone with Imei number on your phone info or about me section and it'll start the process. Takes 4-6 weeks to be delivered. You can not register until 3-5 or it'll tell you invalid registration
I tried to pre order Samsung S21 5G at Samsung Shop. It will not finalize at check out. "Something went wrong, could not link to Sprint Account". Samsung help said it was Sprint issue. Spoke to Sprint, they said it was Samsung issue. I cant pre order!!