Is it illegal for my wife to secretly look at my mobile phone?

Legal analysis: breaking the law and invading your privacy.

Legal basis: Article 1033 of the Civil Code of People's Republic of China (PRC), except as otherwise provided by law or with the express consent of the obligee, no organization or individual may commit the following acts: (1) Interfere with the private life of others by means of telephone, short messages, instant messaging tools, e-mail, leaflets, etc. ; (2) Entering, taking photos or peeping into other people's private spaces such as houses and hotel rooms; (3) Shooting, peeping, eavesdropping or revealing other people's private activities; (4) Shooting or peeping at the private parts of others' bodies; (5) handling other people's private information; (6) Infringe upon the privacy of others in other ways.