Because I don't have time to answer 50 phone calls a day waiting for the one phone call. If I knew what number would be calling, I would answer. I can only take so much of Rachel or extended warranty calls.Why would anyone not answer their phone after testing? I don't know. As I stated...a bit baffling. Positive results are relayed and discussed by phone. Only negative results are emailed. Those who answer often argue about the results.