Can I get my Netease number back?

You can get it back through your ID card, provided that it is the correct ID card for registration.

But I thought, what if you can get it back? Can you guarantee that others can get it back without an ID card?

It is best to buy the number through official channels. It's safer this way

If someone else doesn't have an ID card, if you do, you can use your ID card to get your account back. Be careful next time.