If this happens to you, please transfer the funds quickly if your wallet is still available, you can create a new wallet to receive the transfer from the old wallet.
If your mobile phone is lost, but you still have a backup mnemonic, you can use the mnemonic to restore the wallet and transfer the funds away.
UUwallet technically cannot provide you with operations such as freezing accounts.
You need to keep the mnemonic phrase, password and the phone itself safe.