Responses
From what i seen, on chapter one, he has a hand gesture of holding phone which there was nothing in his hand, then on the later chapter, it show how he stick the pop socket and was holding it in the exact same frame from the first chapter. Now it make more sense on why no one noticed him holding the phone which proven that, it is invisible to other people’s eyes.

Right, I always wondering how is he checking on the phone and no one notice while reading the novel. Now I understand why, the whole ahh phone is invisible