NTT Docomo, KDDI, Softbank Mobile, Y!Mobile Mobile Reception Reviews in Japan

Report Mobile Phone Reception Problems in Japan

Which Carriers Have The Best Wireless Coverage & Data Plans In Japan?

Review comments: NTT Docomo, KDDI, Softbank Mobile  
Click "Add" on upper right corner of map, enter address and select carrier.
Add problem & frequency (dead zone, dropped calls, network congestion)
Share issue with carrier & friends to build support to fix problem.
Detailed Video Instructions

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