I asked Verizon that question. The sales rep said she would try to Port my old number over to the new line, but could not guarantee I would be able to keep the old number. There's a work around, but not sure you have time or maybe you could do it after you get the note 10. You should have time if you did it today, the port would probably be completed in 24 hours.
Port your old number to a prepaid line, cheapest you can find. Once it's active, start a new line at Verizon with the promo deal and have them Port that number back to Verizon on the new line, the prepaid goes away. Only issue, this process takes time and your number would be on the prepaid until you receive the note 10. I would suggest doing it after you get the note 10 if Verizon can't change the numbers out themselves. They can do it, question is will they. I've had to do the porting deal above just to keep a number myself.
The last sentence I circled in there is gray area. Is changing the number considered transferring the line? It looks like they also made it so the note 10 has to be on that line, it states the device is also tied to this agreement.
Maybe there's a easier way, this is the only way I could do it when I had to do it, but back then they didn't have that rule device has to be on the new line and transferring line crap, whatever that means. I say do it if you want to keep your number, it's a work around, but it also gives Verizon the middle finger for their new line required crap that always do.
But, I looked at the website and if I were to have gone in and reordered the 5G, it would still be delivered by 8/23. I guess I have no choice but to wait 8 more days 
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