it is the "vital" ringtone, and sometimes it does that as a notification, or when you are doing more thna one thing.
that's about all i can tell you, hope that helps!
Anyone still getting this? I am getting this on my new sprint epic galaxy s2, but only when connected through the airvana airave.
I reported it to sprint/airave support.
I know this is the 9670 forum but I am also getting this on my 9930. It recently started about a week ago, 4 faint beeps out of the blue. No notifications, no msgs, no emails.....just out of nowhere "beep beep beep beep", very softly, whenever it wants....any ideas?