[Ubersoldat]

Not only on old phones, think about all those Chinese ripoffs of the iPhone, Nokia, etc... yeah! running J2ME!

[pointyhat]

True. Also consider most of the world of Nokia Series 40, which by far destroys any other mobile operating system:

"Analyst estimates place the total number of devices shipped with S40 close to 1.5 billion, as of the end of 2010" [1]

[1] https://secure.wikimedia.org/wikipedia/en/wiki/Series_40