I just found out that a certain person is tapping private phone conversations and WhatsApp and Twitter messages between me and a girl I know. I'm furious. I intend on wiping the phone and changing all passwords, but before that I'd like to find some proof that the tapping was done through malware on the phone. Which malware scanners are good at finding malware that taps conversations and messages? Preferably a free one because I only intend on using it once before I wipe everything. Are there also any other methods through which the guy could have tapped my phone conversations and messages, other than installing malware on the phone?