When the call came yesterday morning, I assumed at first I was being trolled—it was just too perfect to be true. My phone showed only "Private Caller" and, when I answered out of curiosity, I was connected to "Steven," a young man with a clear Indian accent who said he was calling from "Dell Technical Support." My computer, he told me, had alerted him that it was infected with viruses. He wanted to show me the problem—then charge me to fix it.