I usually keep SMS for most messages off, but would like to get @reply messages so I don't miss out on any conversation opportunities. Twitter is blocked on the PCs at work, so I will often notice an @reply 8-10 hours after it is sent.
Is this possible with Twitter or a third-party server (minimal payment is OK.) ?
(This question has some good general answers, if you dont' want SMS: Be notified of @-messages on Twitter )