| Document Date: 2014-08-22 17:20:46
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City Scottsdale / / Company LinkedIn / Pinger / Skype / Telengy / Twitter / YouTube / Facebook / Google Voice / Craigslist / Bandwidth.com / Level 3 / Vodafone / Carrier Bandwidth.Com Pt / PVA / Google Inc / / Country Belarus / Bangladesh / South Africa / Kazakhstan / Indonesia / Russia / Pakistan / United States / Vietnam / Nigeria / Ukraine / India / / Currency cent / USD / / / Event Product Issues / M&A / Product Recall / Security Buyback / / Facility Inc University of California / International Computer Science Institute George Mason University / / IndustryTerm voice transcription software / telephony networks / telephony services / purchase pharmaceuticals / social reputation systems / software scams / web form / merchants advertising access / web service / 1K solutions / abused telephony providers / reputation services / web storefronts / iOS devices / proxy services / online banking / phone reputation systems / free telephony services / phone verification services / domain reputation systems / merchants advertising / telephony carriers / resellers advertising prices / ad syndication services / free call forwarding services / Web services / / OperatingSystem Android / / Organization University of California / Berkeley / George Mason University / / Person Chris Grier Damon McCoy / / / Position author / representative sample / representative / / Product Google PVA / rate / / ProvinceOrState Arizona / / Region Eastern Europe / / Technology SMS / mobile phones / machine learning / Android / OCR / DNS / http / cell phones / VOIP / / URL http /
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Dialing Back Abuse on Phone Verified Accounts Kurt Thomas Dmytro Iatskiv Elie Bursztein †∗ ‡ Tadek Pietraszek