Posting this to hopefully save someone else another 11 hours of customer support...
I tried to have 2 lines moved from a postpaid to a prepaid account. Afterwards, both had data but no voice or texting service. When trying to make a call I would get the following voice message:
"welcome to verizon wireless, we're sorry, the number you have dialed has calling restrictions that have prevented the completion of your call, announcement 19"
We tried 500 things to fix this. Ultimately, what worked is what another post mentioned. The agent changed my number to a new number and then changed it back to the original number. Afterwards, everything worked flawlessly. Did the same process for both lines. We determined that the issue was an incomplete migration between accounts that left the lines in some kind of limbo. Resetting the numbers seemed to restart the migration process, which then completed successfully.
WARNING: I believe this happened to the other poster as well... I was working with an agent via chat for this process. When they changed the number for the line that was the account administrator, I was immediately logged out of my online account, including the online chat. My heart stopped for a moment because now my phone had a new number after using my old number for 15 years.
When I tried to log back in, my online account username and password didn't work anymore. When I tried to reset my password, it tried to verify my identity my sending a text to my original number. Since my number was changed, I couldn't verify the account.
Fortunately, the agent continued the process while I was doing this and changed my number back to the original number. Afterward my number was changed back to the original one, I was able to log back into my account. When I pulled up chat, I actually still had the same agent connected.
If you attempt this process as well, let your agent know that you may get disconnected from chat. In that case, they should continue with the process:
1. Change to new number
2. Change back to original number
Once your number is returned to the original, you will be able to log into your online account again and probably get back into the same chat session. You may want to ask them beforehand how to get in touch with them in case you are disconnected and can't get back to them again.
So happy to have service back again. Hopefully this saves you a painful 11 hours.