How to unlock locked s duos phone?

my samsung DUOS GT-7562 is not working by the methods you gave me above. what shall i do please help me. 

... Switch ON your Samsung Galaxy S duos with a NOT ACCEPTED SIM Card ... .samsung.com/in/consumer/mobile-phone/mobile-phone/dual-sim-phone/GT-I9082EWAINU 

thanks.. network data mode worked for me.... 

i press the volume up+down+home+power button but did not open the restart option 

Thanks a lot. Data network option worked for me and not lost any data. Thanks ... 

Too many pattern attempt in Samsung Galaxy S Duos GT-S7562, Forgot gmail Password,i tried above steps but sill showing same screen after the restart. what can i do please help me...... 

thank u very much.. through data network mode procedure is worked out for me... 

... this your mobile will be unlock... enjoy..... 

thank u very much dear when data network enabled by using power on button my phone unlocked b 

... where you can select your lock password/pattern. Hope this helps ...  

... to remove the lock screen. Turn off the phone then press Volume ... the process completes, the phone will be unlocked, but the applications installed ...