1krBlocker checks new messages as they arrive. To check the ones you already had before installing it, or that arrived while another app was your SMS app:
- Open Settings → Scan my existing messages.
- Check the last 90 days for scams. Only adds risk labels; nothing is moved.
It runs in the background ("Scanning in the background…"). Afterwards, risky old messages show a warning sign in Messages, and you can open Why? on them like on any message.
Nothing is moved to quarantine and nothing is deleted: you decide what to do with each message. Like every check, the scan runs on the phone and sends nothing anywhere.