The phone is lost, the mnemonic is gone, and there are no other backups of the keystore or private key. In this situation, recovery is not possible. You must have the original phone, and the original wallet must not have been uninstalled.

Hello Mr. Shen! A friend downloaded the mytoken wallet on their phone, which contained Bitcoin. Later, the phone was lost, and the phone number is currently being used by someone else. They want to open the wallet but cannot remember the mnemonic phrase and password.
In this situation, is it possible to recover the Bitcoin?
If recovery is possible, how can they contact you to retrieve it?
Thank you!