Does divorce occur if the wife talks to her friend on the phone, given that the husband threatened divorce if she sent a message to her?

The صيغة (expression or formula) uttered by the husband, "a promise of divorce," does not constitute a divorce, and fulfilling this promise is not required. The husband's intention is considered in matters of divorce, so he is to be referred to regarding what he intended by the words he uttered. It is advisable to be diligent in dialogue and understanding between spouses, to resolve problems with wisdom, and to avoid divorce.