How did Wang Baoqiang discover that Ma Rong was cheating on Song Zhe?

One day, Ma Rong was not at home, and there was a mobile phone to charge at home. Wang Baoqiang found that the chat records of Ma Rong and Song Zhe were full of wives and husbands. Wang called Ma Rong to talk about it. Ma Rong refused to communicate and never went home. He also threatened to make Wang honest.