How to copy the text message between husband and mistress as it is as evidence? It needs notarization to take effect.

You put his card in your mobile phone, and then copy his short message to your mobile phone. If it is convenient to check later, if he doesn't admit it, you can pull his phone bill, and then he has nothing to say. You find a camera to take pictures of everything in his mobile phone and develop it. Then you can take photos to copy the contents of his mobile phone card and pull out his phone bill. It is useless for him to explain.