Xperia Z3 (401SO-Soft Bank) Data Connection Problem

Hello,

I have bought a Xperia Z3 last month from hong kong. which model no. is 401SO From soft bank.
Now the problem is, i can not use mobile data. Data indicator showing its ok, but its not working. everything is ok.
I can use wifi but not mobile data.

when i try to enable mobile data, its shows nothing. But, no data connection indicators are showing in notification area.

Please help someone....


thanks