I am a band new Blackjack user and I have to say....I love the phone!! So far my only complaint is that if I use a wall charger, I get a constant chime and the screen stays activated. If I use the car charger or its connected to the computer then nothing.
Its the same chime that you hear when you connect the power source.
I also have a constant chime while having my BlackJack connected to the wall charger. My phone never seems to charge (must be pulling as much juice as it is getting). The only way I can get my phone to charge is to turn it off completly (even turning the bluetooth and phone off in Wireless Mgr does not help). I have tried stopping all tasks but that does not seem to stop the chime. As soon as I unplug the wall charger, the chime stops.
I had this problem when using a faulty charger (3rd party -- not Samsung brand). I was on a business trip and grabbed the wrong charger. My phone died at 8:30 on a Sunday night, so Wal-Mart was my only option. :-( Just like you, I had a pretty constant chime, but it never charged, even with the phone turned off.
I've never had problems with any other chargers, even other 3rd party ones, so there must have been something wrong with that one.