The systems used for mobile phone communication in Japan, are completely different to those, used in other parts of the world and therefore, your handset, regardless of whether it has tri-band capabilities or not, will be incompatible with the Japanese networks. The original system in Japan was the J-TACS analogue system, which operated at 25MHz, but it has now developed a digital system based on the D-AMPS technology that was designed for use at 30MHz. The new system is now known as Personal Digital Cellular, [PDC], or Japanese Digital Cellular, [JDC] and has become the second most popular mobile system, the first being the GSM network
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