Chinese student Zhang Yi claims to have owned and used around 500 mobile phones over the last nine years.

Since his father, a mobile phone wholesaler, handed over the first phone in 1998 Zhang has developed a taste for new handsets. Keeping each one for only a few months and selling them to his friends Zhang has become a consultant and problem solver for fellow students.

Zhang commented:

I got my first cell phone in 1998, as a present from my father. I felt a great sense of fulfillment after learning all of the functions. From then on, a mobile phone has been like a big toy to me. I always want to have the latest one to learn its functions.
It takes less and less time for me to fully understand a new model, and I still haven’t found the phone which suits me best.

Ananova via textually