My iphone 5 is locked for Japan KDDI when i bought?

My iphone 5 is locked for Japan KDDI when i bought it, i have been using R Sim since thn and now updated my IOS to 7.1.2. After update i checked my imei on the imei checker to find out whether its still Locked but it says unknown, I tried inserting my sim without my R Sim which says under carrier My current network Dialog,. But when i tried using without R sim it takes me to activation screen,, couldnt activate due to unsupported sim please help thanq

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