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DoCoMo's Mr. Yamada said he expects the number of LTE subscribers to reach 15 million by its fiscal year ending March 2015.

DoCoMo expects to complete testing of a fourth-generation LTE Advanced network by 2015 , Mr Yamada says .

"Our future depends on how fast we can shift [to smartphones ], " Ryuji Yamada, DoCoMo chief executive, says .

"We went first and when we looked behind us there was nobody there, " Mr Yamada said .