Prosecutors say the former neighborhood watch leader can be heard telling her to buy bullet-resistant vests. They say Zimmerman also instructed his wife to transfer money between bank accounts.
Zimmerman was released on $150,000 bond in April several days after the phone calls took place. At his bond hearing, Shellie Zimmerman had testified she didn't know how much money had been raised from a website created for her husband's defense.
She also testified that they had limited funds because she was in school full time and Zimmerman wasn't working. Prosecutors say the phone calls prove the Zimmermans knew that roughly $135,000 had been raised by the website.
Shellie Zimmerman was arrested last week on a charge of making a false statement.
George Zimmerman is charged with second-degree murder. He has pleaded not guilty, claiming self defense during the confrontation with 17-year-old Trayvon Martin in a gated community in Sanford, Fla.
The Associated Press contributed to this report.