There is no danger of 'big brother' watching you with the system. Note that there are over 5 Million OnStar enabled vehicles on the road. The shear volume of data makes it very impractical to do so.
The only reason to attempt to pull the system out would be to avoid the tracking of a stolen vehicle. To aid in such an endeavor by describing how to remove the system would be the promotion of illegal activities which is against the policies of WikiAnswers.
Aggie80