League of Legends pro Yiliang "Doublelift" Peng recently recounted on a Twitch live-stream how he lost his entire Coinbase account balance to a port-out scam. He says that a few weeks prior to the theft, his T-Mobile phone's service was terminated and the device was listed as lost or stolen...
I happen to be a T-Mobile customer, and apparently the company has identified "Port-Out Scams" to be a big enough of an issue to prompt its entire customer base to add another level of security to their accounts. At least now I have one more reason to justify making sure I have no banking...