Phonelink uses libGnokii, which was originally developed to access (now-old) phones running a proprietary Nokia OS; but it has had some Symbian capability (though not all variants) and AT (most other phones) capability added, so it (and thus phonelink) works with many phones. Dunno about the Blackjack in particular.

IIRC, it does (when told to) wait for SMSes and receive the text; it also waits for incoming calls and sends a dbus notification, so you can set up a task to alert you when your phone rings...