Is verbal divorce over the phone valid if there was an intention to divorce? Can the wife be taken back over the phone without a witness? Is the wife's consent necessary for her return, or is the husband's intention sufficient?

Writing a divorce or a revocable divorce (raj'ah) via phone depends on the husband's intention. If he intends divorce, it occurs. Similarly, the revocable divorce (raj'ah) is a metaphorical expression (kinayah) that depends on intention. It is recommended to have witnesses for it, but it is not obligatory according to the majority of scholars. A woman in her waiting period (iddah (definition)) after a revocable divorce is considered like a wife, and her consent is not a condition for the validity of the revocable divorce (raj'ah); it is a right of the husband.