Should you be jumping to the worst conclusion if there's a facedown phone in your relationship? Dave's mobile phone either superglued to his hand, or else it lives life inside his pocket, next to his trouser snake. 56 per cent of cheaters used their mobile phone as their prime source of contact. \"Phone always on them, phone always locked up like Fort Knox, weird about phone password, phone on silent, phone screen always closing as you approach, phone always taken to toilet and shower, secret vault type apps on phone - that's what my cheating wife was doing. “A phone that is suddenly placed face-down after being years with someone would be a possible red flag,\" she says.