The Correct Answer is: Hang up and call Schwab by finding their phone number on Schwab.com
Scammers will often ask you for a code sent via text message so they can hack into your account.
Schwab understands that you should be suspicious of receiving a phone call from someone claiming to be Schwab, and if there truly is a fraud concern, you can call their number (found on their website) to have a representative look into it. Do NOT call a phone number provided by the caller since that could be a false number. For reference, our clients can call Schwab directly at 800-515-2157.
Never provide a Schwab security code over the phone, since it says, "Do not share this code with anyone, even if they claim to be from Schwab.”