It's been a long time coming, but this week finally saw Sony allowing the use of two-factor authentication to protect your PlayStation/Sony Entertainment Network accounts, via SMS verification codes.
Details and activation links available here: https://www.playstation.com/en-us/account-security/2-step-verification/
I'd highly recommend that everyone enables this on their account, *especially* if you have it linked to a credit card or PayPal. Don't be that person who suffers an account hack and resulting financial loss! I've had this enabled on my account for a few days now and it's really not much additional hassle.