What is the ruling on divorce via mobile phone messages, and is it permissible to retract it, and what are the conditions for doing so, if it occurred in a state of extreme anger and only once, before consummating the marriage and after the marriage contract?

If you found the intention of divorce when it was written, then the divorce has occurred and there is no turning back from it. It is an irrevocable divorce here because it occurred before consummation. So, if he wishes to return to her, a new contract is necessary, with its conditions and pillars.