The biggest obstacle in Java's path to becoming the dominant software architecture for mobile phones has been its fragmentation - both in terms of technical features and the various licensing schemes adopted by its early exponents. The past two years have seen the handset makers and large operators increasingly taking the steering wheel of the mobile Java movement, seeking to create unified platforms and work around the confusion caused by Sun's halfhearted open source approach.
http://www.regdeveloper.co.uk/2006/11/06/motorola_os_increase/