Protect yourself against identity theft. Never give out personal information when you receive an unsolicited phone call.
As a rule, jury officers never ask for confidential information over the phone. Jury staff members generally correspond with prospective jurors via mail or email. There are certain situations such as, a Junior and Senior live at the same address and the summons does not specify which one that more information may be required.
Sample Scenario: You answer the ringing phone. The caller identifies himself/herself as an officer of the court. The caller states you failed to report for jury duty and that a warrant is out for your arrest. You say you never received a notice. The caller says no problem, it can be cleared up right now, but more information will be needed for "verification purposes" -- your birth date, social security number, maybe even a credit card number. Or the caller might say that if you give him/her that info to pay a "small fine," the warrant will be dropped.
You should hang up the phone and report the call to law enforcement, as it is a scam.