You'll need to recover your wallet on a new phone.
- Enable Google Drive/iCloud recovery on your old phone.
- Download Argent on iOS or Android
- Open the app on your phone and tap "Get started" then use the email associated with your wallet to proceed with recovery.
- Proceed with the recovery following this guide.
IMPORTANT: On iOS if you used iCloud restore, your wallet won't work if you simply recover it from the backup. Please follow the steps above instead.