You can remove the sim lock from your phone using unlock code.You can get the unlock code for your Samsung SGH-C450 phone from your Network service provider or any third party online Vendors like SimpleUnlocking.com here they ask your country,Network name to which it is locked,IMEI number of your phone.Then they deliver unlock code to you through mail. And you can get free unlocking instructions from the site MobileUnlockGuide.com
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