Http://lgunlockcode.org/products/LG-LS670-Optimus-S-Unlock-Code.html
usually one must buy a code or find and download world unlocker that MAY work?
http://www.softpedia.com/get/Internet/Telephony-SMS-GSM/WorldUnlock-Codes-Calculator.shtml
If your phone LG Optimus S LS670 is a CDMA phone from Sprint, then it can not be unlocked to work with GSM carriers. A CDMA phone can not be used on a GSM network provider regardless if it is unlocked or not.
CDMA phones technically can be unlocked but not in the same sense that people think about GSM/LTE unlocking. Since CDMA phones do not use a SIM card, they are like being hardwired to the provider that sells them. As there is no built in locking software mechanism, there is no simply unlocking method. Instead, CDMA phones can be reprogrammed to another CDMA carrier options through a process called "flashing".
n order to unlock your CDMA phone and switch to a different CDMA carrier, you need to call the receiving carrier and ask them to activate your phone onto their network. Most of the time the carrier can activate your phone over the air. A CDMA phone can not be used on a GSM network provider regardless if it is unlocked or not.
If you wanna be 100% sure, you can ask to an online company that provides unlocking services if they can unlock your phone.
http://www.lgimeiunlock.com/lg-optimus-s-unlock
http://www.htcimeiunlock.com/htc-blog/unlock-cdma-switch-cdma-carriers-keep-phone-2013-02-07/
SOURCE: I have a lg optimus
sir if you forgot the password or don't know the security code, You have to master reset the phone. Contact your service provider to get a master reset code at free of cost....You can also visit http://www.unlock-zone.com/ and can see different options there to get unlock code for a price. Choose any price appropriate for you.................
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