HOW DOES SAMSUNG UNLOCKING WORKS OR PROCEDURE OF SAMSUNG UNLOCK??

How to check if your samsung phone is locked or unlocked??

Insert any non accpeted sim card into phone and you will see a box with code,it means you phone is locked.

if you dont see any box that means it could be unlocked,the best thing is to check Samsung Imei check report

How to unlock the samsung phone after you have received unlock code from us??

-Turn off your phone
-Insert a non-Accepted sim card. 
-Turn on the phone. 
-An empty box will appear and it will ask for the unlock code(i.e Unlock Code: 2906614808724162)

-Enter the unlock code
-Your phone is now fully unlocked!

Please make sure you enter correct code and dont try too many times.

How abut if samsung phone asks for PUK CODE, what is PUK CODE and can i use Unlock code for Puk Code??

PUK code means that you have tried 3 times incorrect unlock code and your phone is Hard locked now that why it asks for PUK code AND dont use unlock code for the place of PUK Code

SIM network PIN blocked. Enter SIM network PUK"  it means same thing as HARD LOCKED and please open the PUK code before buying Samsung unlock service.

Can rooted, modified or Tampered samsung phone can be unlcoked ??

No,