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There are electronic phone-tree programs available for a small monthly fee from local telephone service providers which can distribute pre-recorded messages to lists of phone numbers . Just recently , you denied that the NSA puts out an electronic net that intercepts thousands of phone calls looking for key words . Most surveys are conducted by people making phone calls from random lists of phone numbers . Also we had lots of phone card issues in Australia . One of the most obvious disadvantages of phone interviews is the possibility of technical difficulties . In response to hundreds of phone calls and inquiries , military branches and other response organizations in Kansas have banded together to suggest ways to support deployed service members serving at home and overseas . Without getting into the numbers , is there a broad , wide-scale electronic net that you put out that means that you intercept lots of phone calls or communications involving Americans , or is there not ? As a statistician friend of mine who used to work at Harris Polls says , " polling companies burn through hundreds if not thousands of phone numbers to get the sample sizes they need .