Sony Ericsson T630, Sony Ericsson Z600, and, Sony Ericsson T610, all have Bluetooth, and Java support, but MIDP 1.0, not MIDP 2.0.
This means that Java applications aren't able to access many functions such as camera, internet, and Bluetooth, which is the problem in this case.
These are useful webpages for those who own one of these phones:
JAVA SOCKETS FOR T610 Petition - Petition to Sony Ericsson demanding MIDP 2.0 in the T610
Give T610 Java MIDP 2 Support (irc/msn/bluetooth/etc...) - Forum topic archive of a thread discussing the lack of MIDP 2.0 and its concequences in everyday situations
Reply to Nokia: FreeJack at bluejackQ® discussion forums by eXentric - An old, but informative, post in an unrelated topic which discusses possible workarounds of the limitations of MIDP 1.0
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