Is it permissible for a husband to look at his wife’s mobile phone, and is it permissible for a wife to look at her husband’s mobile phone?

The questioner:
Honorable Shaykh, may Allah grant you success. He says: Is it permissible for a husband to look at his wife’s devices, such as her mobile phone and computer, to monitor what she is looking at and who she is corresponding with?

The Shaykh:
There is no doubt about this; it is obligatory for him because he is her guardian, so he monitors her. If he finds something, he prevents her from these matters, and she does not use them, which is better for her. But if he is unable to prevent her from them, then at the very least he monitors her and checks on her.

The questioner:
Likewise, may Allah preserve you, he asks and says: Is it permissible for a wife to look at her husband’s devices for the same purpose?

The Shaykh:
Yes, if the intention is to forbid what is wrong, to forbid evil, then it is obligatory for her, and it is obligatory for him toward the other. This is part of forbidding evil. Yes.