SmsFirewall is a simple SMS scanner/filter application. It allows SMSes only from your contacts to reach your inbox. But sometimes, you may want to allow SMSes from some senders who are not contacts in your phone. So you could set up an allowed list. SMSes from all other unknown users are quarantined by the application to a safe vault. You can read and delete SMSes from the vault. There are minor goodies like notifications and monitoring-only mode.
Tags: Sms, Filter, Firewall, Blocker, Guard