I lent money to others, but I didn't have an iou. Now there is a short message and a telephone recording on my mobile phone. Can I sue through the court?

You lend money to someone, but you don't have an iou. Now there is a short message and a telephone recording on your mobile phone. As long as the other party acknowledges the existence of debt in text messages or recordings, these can be used as evidence, and you can file a civil lawsuit with the court.

If you only send a short message unilaterally and fully recall who asked for money unilaterally, but the other party has never admitted it, then this evidence is difficult to prove that the other party owes money. You can also sue, but the chances of winning are slim.