Tata DOCOMO : Roaming Facility in Japan and Korea.
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Roaming Japan and Korea

The roaming facility is available on, but not limited to, the following handsets:

Nokia Sony Ericsson Motorola
Nokia N70

Sony Ericsson M600i

Motorola RAZR2 V9

Nokia N71 Sony Ericsson K608i  
Nokia N80

Sony Ericsson K610i

N95 Sony Ericsson W850
Nokia E61 Sony Ericsson W910
Nokia 6630 Sony Ericsson V800
Nokia 6280  

You can also contact your handset manufacturer to check if your handset is 3G enabled and can be used in Japan and Korea.

In case your handset does not support 3G facility, you can always rent a handset while visiting Japan and Korea . For further information on renting of handsets, you can log on to the following websites:

Japan Korea
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Tata DOCOMO : The Best Roaming Plans for Japan and Korea.