What does it mean when a guy turns his phone off?
Watch his cell phone behavior
He may have his cell phone turned off because he is with his affair. If you have access to his cell phone, check it for repetitive unknown numbers and suspicious text messages. If you have access to his mobile phone bill, note repeated calls or calls of long duration and the times.
Why does my boyfriend hide his phone at night?
If your boyfriend is overprotective with his phone, he's probably hiding something from you, and most likely, it's because he's engaging in inappropriate communication with other women. ... If your boyfriend has nothing – or no one, for that matter – to hide, there's no reason he should be secretive with his phone.