finally wd670 unlocked .. and now am using all national and internation 4g sims with it .
i found this guy on youtube who connect to your device and unlocks it for you .
his channel name is riotech india. for a small fee payable via paytm (Rs 350) . or online.
check out guys finally after 2 years i am happy
his whats app number is 0091 7531023676