How do we fix my phone PUK LOCK?

No. It doesn't look like your phone has an earphone jack. You can look at the manual at the address below.
?https://www.manualowl.com/p/Samsung/SGH-S125G/Manual/172604

SIM LOCK can be unlocked by a samsung service tool. Or phone flashing dongle such us HWK USFX.

Hi, If you've locked your phone through entering an incorrect pin number 3 times then you need a Puk code, Ring your service provider and they will give you the FREE Puk code.....
If you lock your phone again some time in the future and you're still with the same service provider you can use that same Puk code.. CHEERS..

sir i ned to sim lock code- samsung sgh t404g (gp)

PUK stands for Personal Unblocking Key. This is a uniqueeight-digit code specific to your SIM card. This is required when the PINnumber to unlock your mobile phone is entered incorrectly 3 times. You are thengiven 10 attempts to enter your PUK code. If an incorrect PUK code is enteredafter the 10th attempt, you will block your SIM card permanently and willrequire a new SIM card from your mobile phone provider.
PUK codes can be obtained through the following ways - The PUK code is in your SIM card documentation Starter Pack.If you do not have this then -Please contact your phone service provider.
Your cell phone service provider can give you the PUK code once you give themyour account details and they have confirmed your identity.

please enter the reset code and enter .

hi my N96 is asking for for lock code number,nokia corporation 356962/01/53383/2,code 0551192,WLAN:001C9A35EBDB,
FCC ID PONRM.159 MADEIN FINLAND,
MODEL N95-1,TYPE:RM-159

A lot of sites do unlock but there is this site I used couple of times and it pays best since I've been unlocking phones.

You get full money back guarantee.

Visit http://www.mobileunlocked.com/index.php
and just follow the site prompt.

Good luck and remember to rate this solution.

The puk code is sim card spesific it comes with the sim card when you get it or you can get it by calling your phone service provider of the sim card to get the puk code.
if you have entered the puk code wrong too many times you will make the sim card useless and you will have to contact your phone service provider for a new sim card, it will probably cost.

Try a hard reset *2767*3855#