mobile

I got this T999V samsung s3 phone with wind network , one of my friend took it to another country. He asked a technician to unlock this phone. Somehow he unlocked this phone to work in that country. When he got it back in Canada, its not picking up its original network which is wind.

I flashed stock rom (downloaded from sammobile for 4.4.2 T999V) , but still not getting wind network. Its working okay with rogers network but not with wind

Any advice