Who called from 6603496382

The usual credit card scam.  If your balance is over $10,000, they can help. All you need to do is give them your card number.

No ID, no message.

Unknown caller.  No message.  I blocked.

Called but left no message so that means BLOCKED FOREVER

Robo caller
The usual credit card scam.  If your balance is over $10,000, they can help. All you need to do is give them your card number.  This is a sure fine assurance of fraudulent ID thief as reported by FTC.