The Higher Administrative Court of Berlin-Brandenburg has ruled that surveys of subscriber satisfaction by telephone may not be used for obtaining consent to advertisement of other company products via telephone, email or sms, unless the subscriber consented to such a use of his or her telephone number when concluding the subscription. The Court hereby followed the ruling of the Administrative Court of Berlin and the Berlin Data Protection Officer, Dr. Alexander Dix, who had interdicted a media company from disguising advertising calls as a satisfaction survey.

Higher Administrative Court ruling (PDF) (in German)