Personaly, I have used Samsung 740SC on a prepaid basis from Softbank. I bought it from DonKichote for 14000 yen with 6000 yen credit included.
One of the coolest feature is "1 seg" tv tuner. Before I used mainly Nokia, SE phones and Samsung D900 in the UK . I was very happy with 740SC and its price/features ratio.
NTT DoCoMo Inc exhibited a prototype of the "Separate Keitai," a mobile phone whose key operation part can be separated from the display part at CEATEC JAPAN 2008. The prototype use magnets and bluetooth to deliver modular functionality. Fujitsu also displayed a smiliar prototype.
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Na targach CEATEC JAPAN 2008 w Tokyo, Japonia zaprezentowano koncept 'rozlaczalnego telefonu', ktory wyroznia sie "rozszczepialna struktura". Dwie rozlaczone czesci moga dzialac niepodlegle, zlaczane sa magnesem i komunikaja sie ze soba uzywajac technologii Bluetooth.