Hackers have been calling Verison, T-Mobile, and others asking them to transfer control of a victim's phone number. Once they hijack the number, they can reset passwords and frequently focus on stealing from virtual currency wallets.
Most victims of these attacks in the virtual currency community have not wanted to acknowledge it publicly for fear of provoking their adversaries. But in interviews, dozens of prominent people in the industry acknowledged that they had been victimized in recent months. “Everybody I know in the cryptocurrency space has gotten their phone number stolen,” said Joby Weeks, a Bitcoin entrepreneur. Mr. Weeks lost his phone number and about a million dollars’ worth of virtual currency late last year, despite having asked his mobile phone provider for additional security after his wife and parents lost control of their phone numbers.