In the US, carriers are legally required to port your number to your new service, but they can delay the process by up to a week. Generally, it's much much faster (I've ported numbers in literal minutes), but I don't know how it would go with a banned account.
If you have apps, movies etc bought from Google Play — those are gone too.
If you use a @gmail email address, you lose that too and you now have to tell people not use that any more.