Coinsquare, the impacted exchange, says a former employee stole the data.
SIM swappers have escalated from bribing employees to using remote desktop software to get direct access to internal T-Mobile, AT&T, and Sprint tools.
The mobile phone fraud scam has jumped up in popularity over the past couple of years, and there's very little to stop you from becoming a victim.
Some Instagram users are at particular risk of sim hijacking, where a hacker takes control of their phone number and uses that to break into accounts. Now, Instagram is pushing towards app-based authentication, which should make the hackers' job harder.
A hacker learning your phone number can be the start of all sorts of account hijack mischief. The Timehop breach is probably a good time to protect yourself against SIM jacking.
When a site offers different methods of authentication, your account is only as secure as the weakest option. Here, Motherboard shows you how to use the most robust method for locking down your Twitter account.