How to go to service mode in galaxy s duos?

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

... code. Switch ON your Samsung Galaxy S duos with a NOT ACCEPTED SIM Card ... 's being displayed on your Samsung Galaxy Note 4G. Compose : #0111*CODE ...  

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...  

switch off your mobile and press volume up + power on button, then select Wipe data/Factory Reset enter ok..then select reboot device, now your mobile will be restart, after this your mobile will be ...  

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

... 2. Data network mode 3. Flight mode 4. Restart Select Data network mode and now try ...  

... button + Power Button until the service menu appears. From that list ...