I plan to buy an unlocked Pixel 6a for the Verizon account I already have, but need a newer SIM card for it because my current phone is old. Does it matter from a technical or privacy standpoint whether I bring the new phone to Verizon to have the SIM put in immediately while it's still on the preinstalled Android or order one from Verizon online and put it in after installing GrapheneOS?
Sorry if this is a dumb question; I'm pretty good with free software, but don't know too much about phones. Thank you!