Regardless of the reasons for the prior replacements, this current blackberry is dropping calls regularly to the point that an AT&T CSR looked at my logs for the past month and determined that I've had so many dropped calls that AT&T should give me a free 3GMicrocell. Even after the receipt of this product, my blackberry continues to drop calls.
I have spoken to att technical specialists regarding the issue and they have troubleshot the device and determined that it is related to the device itself. I'm at the point that I wish I could switch to my iPhone but I need my BB for work.
As for JSander's post, I don't particularly appreciate you accusing me of working the system...but thanks for your concern.