As of the release the recovery of Argent Starknet mobile wallet is possible offchain only, however, onchain recovery of the wallet with Starknet guardians is in the works.
If you have your Encrypted Recovery Kit, you can proceed with the offchain recovery.
In order to be able to recover your Starknet wallet alongside with Vault and zkSync wallets, you will need to save or update your Encrypted Recovery Kit when you are prompted.
You can find the guide on saving the Encrypted Recovery Kit here.
If you have no access to your Starknet account on a previous device and it shows as Read-only in the recovered wallet, email us to support@argent.xyz and we will help further. Your assets will not be lost.