I have a 7105T with a motorola H500. Half the time when i connect, people i call say there is a whining noise, and other times both the receipients and me hear a crackling. All the time there is low low volume. Is this the headset or do you think I have a bad bluetooth receiver in my 7105T? Anyone else had this problem?

If they will let you, go to a T-Mobile store and sync to a different headset and see if the problem is still there.