I have the OEM Bluetooth package and use it with a Blackberry too. I have not any complaints of static (although people have reported that it is not as clear as the Bluetooth in my other GM vehicle). Id say try it with friend nearby so it would be easy to compare and try to determine if it is your phone or the car. Since you also have OnStar, can you call OnStar and ask the rep how the audio sounds? As indicated above, OnStar uses the same MIC and some of the same electronics in the audio path -- you may have a bad mic, shield wire broken, poor ground, etc.