2005 is when I got a second-hand Sony Ericsson K750 phone that had been reflashed to the W800 Walkman phone firmware (the hardware was the same) and I started using my phone as my MP3 player. It was also my only usable digital camera (the other one was one of those terrible cheap RAM-based ones, and this had a really decent 2MP shooter). Really that device delineated the beginning of the convergence era for me.