One such number ended up linked to a username on a football forum: .

(identity verification) to comply with local anti-addiction laws.

However, due to strict privacy laws and game Terms of Service (ToS), I . Doing so would be illegal (violating China's Personal Information Protection Law) and would get any gaming account permanently banned for identity fraud.

If someone gives you an "unused" ID (a guest account they started), it is likely already bound to their device ID. If you try to login on your phone, the system will often detect a mismatch or force a server sync, overwriting the data. You cannot simply "transfer" a guest account easily without the original device info.