Data mobile internet

Try this site:
http://sim-unlock.net/unlock/Samsung/
http://sim-unlock.net/unlock/Samsung/

It sounds like your samsung is locked to particular network.. You can remove this network restriction using unlock code.. you can purchase such code from any vendors online like
http://www.simpleunlocking.com/samsung-galaxy-s-duos/rs16wp9/

put sim card in the other slot . contact service provider, recharge your account

If your mobile is unlocked by any Service Providers, go to this Link http://www.theunlockspot.com. Otherwise Follow the Instructions given to you Below:-
1 - Switch ON your Samsung Galaxy Y Duos S6102 with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung Galaxy Y Duos S6102.
3 - Compose : #0111*CODE#

Hi,after getting codes for your mobile follow the instructions about how to unlock your mobile..
Warning: Do not enter any wrong unlock unlock codes on your Samsung SGH-F480 mobile phones. If you enter over a certain amount of wrong unlock codes on your mobile phone, your phone may get hard locked and sometimes become unusable.

Method 1:

1 - Switch ON your Samsung SGH-F480 with a NOT ACCEPTED SIM Card.
2 - Samsung SGH-F480 will ask for "Password".
3 - Enter the Unlock Code.

OR (if the Samsung SGH-F480 shows "Insert Correct SIM Card")

Method 2:

1 - Switch ON your Samsung SGH-F480 with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung SGH-F480.
3 - Compose : #0111*CODE#.

NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Samsung SGH-F480 is locked to.
CODE: Its the unique Unlock Code for your Samsung SGH-F480.

If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung SGH-F480.

Each Samsung SGH-F480 mobile phone has an unique unlock code.
i got instruction from mobileunlockguide

You can specify the Current network it locked now?? Then you can use the Unlock code to Open the Mobile From the Network lock,You can get the Free Unlocking Instructions from here Mobileunlockguide Samsung T109 Unlocking Instructions
Warning: Do not enter any wrong unlock unlock codes on your Samsung T109 mobile phones. If you enter over a certain amount of wrong unlock codes on your mobile phone, your phone may get hard locked and sometimes become unusable.

Method 1:

1 - Switch ON your Samsung T109 with a NOT ACCEPTED SIM Card.
2 - Samsung T109 will ask for "Password".
3 - Enter the Unlock Code.

OR (if the Samsung T109 shows "Insert Correct SIM Card")

Method 2:

1 - Switch ON your Samsung T109 with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung T109.
3 - Compose : #0111*CODE#.

NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Samsung T109 is locked to.
CODE: Its the unique Unlock Code for your Samsung T109.

If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung T109.

How To Unlock a Samsung Phone1. Power on your Samsung mobile phone with the UNACCEPTED SIM card inserted.
2. Your Samsung phone will prompt for a password (unlock code).
3. Now enter your Samsung unlock code.
Otherwise, if your Samsung mobile phone displays "Insert Correct SIM Card" then:
1. Turn on your Samsung phone with an UNACCEPTED SIM card inserted.
2 - Type: #0111*CODE# (Where CODE is your Samsung unlock code
Once you have unlocked your Samsung phone you will be able to use it with any phone carrier or network. Most websites would suggest paying for high priced unlock codes and instructions. Always try calling your phone carrier before resorting to paying for an unlock code. If this phone guide did not help unlock your Samsung phone, please let me know.

Hi,
Please see below instruction in unlocking your phone. Call first your service provider to get the code. then follow instruction and information below:
Get your IMEI Number by:typing *#06# and hitting enter.
How To Unlock Samsung Strive A687 (SIM Unlock)
1. Power on your Samsung mobile phone with the UNACCEPTED SIM card inserted. 2. Your Samsung phone will prompt for a password (unlock code). 3. Now enter your Samsung unlock code.
Otherwise, if your Samsung mobile phone displays "Insert Correct SIM Card" then:
1. Turn on your Samsung phone with an UNACCEPTED SIM card inserted. 2 - Type: #0111*CODE# (Where CODE is your Samsung unlock code).

the default lock code is 00000000 i.e eight zeros! bt if u have changed it then u have to go to the samsung service.please rate me