Is it illegal to track your husband's cellphone?

Tracking your husband's cellphone is illegal if it's done without his consent. Electronic spying runs afoul of the Computer Fraud and Abuse Act as well as many state laws and puts you at risk of being charged with a felony, at worst, according to Lawyers.com.

Additionally, Rosen Online states that the Electronic Communications Privacy Act prohibits you from tracking your husband using credentials he has given you for another purpose. If he gives you his Apple credentials so that you can order content on iTunes, you cannot instead use those credentials to discreetly track his cellphone using the built-in Find My iPhone feature.