Unlock Sony Xperia Z4 402SO Softbank by official code

Sony Xperia Z4 is version of Sony Xperia Z3+ in Japanese domestic market
Sony Xperia Z4 is locked Docomo network with model SO-03G, Sony Xperia Z4 is locked Au KDDI network with model SOV31 and now, our video is Sony Xperia Z4 is lock Softbank network with model 402SO
We can order factory unlock code from official Sony's server, so that I can make sure about safety, accuracy and cost
We need just entering code of unlocking with one times. It will be unlocked permanently
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