Does a divorce occur if the husband says to his wife, "You are irrevocably divorced by three if you touch or search my mobile phone," then the child opens the mobile phone with the hesitant permission of the mother?

It appears from the question that the divorce did not take place, because the husband conditioned the divorce on touching or inspecting the phone, and that did not happen. A conditional divorce does not occur unless the condition it is contingent upon is met.