Ruju During Iddah
These are two different questions. In the first case, the iddat ends with the completion of the third menstruation. During this period, the husband has the right to announce Ruju. He can do it with an SMS. After Nikah, if a spouse renounces Islam seriously, it does not invalidate Nikah. If either of them wants to end the marriage, it will take its due course. If the husband claims that he pronounced Talaq in a state of anger and he did not intend to divorce, his statement can be accepted if the wife feels satisfied with his statement, or if the matter is taken to an arbitration, the arbitrator may or may not accept his excuse after examining the situation.