It sounds like you're correlating forgetting who you were and the phone, but you should be correlating the LSD and forgetting who you were. These drugs de-activate the "ego" forming parts of the brain, the parts that make us feel like an author/being/center of it all.
While it's certainly true that LSD is the primary reason I had ego semi-dissolution in this experience, I'm saying that phones serve to reinforce our understanding of ourselves by "interrupting" our raw conscious experience with memories and data that we correlate with our self. On other trips where I had my phone, or when I was at home in an environment I've known all my life, I had virtually no ego dissolution at all.
