Hi you can use codes to unlock the mobile .to get the unlock codes visit here
http://www.unlocking4free.com/
Here they ask the following details before rendering the unlock codes they are
1. Mobile model
2. Country from where you brought the mobile
3. Provider to which the mobile is locked
4. Imei number of the mobile
Finally they will send you the unlock codes at free of cost.once
you entered the code in your mobile as for the instruction
given by them .your mobile get unlocked and it accepts any network sim
to get the IMEI:
Unlock Your Samsung Sgh-t528g Mobile Phone Via IMEI. Your phones IMEI is your unique number that is given to each phone. For each IMEI there is a unique unlock code that once entered into your Samsung Sgh-t528g phone will enable you to use any compatible sim card. You can get the IMEI for your phone by entering*#06# into your Samsung Sgh-t528g keypad. You will only need 1 unlock code to enable you to use any sim card in your phone and enable it to be "network sim free".
you can also try going to this site:http://www.foneszone.co.uk/unlock_codes/Samsung/Sgh-t528g.php
though this site may not guarantee a free service:
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I HAVE A SGH-T528G PHONE THAT NEDED TO BE UNLOCKED SO I CALLED STRAIGHTALK MY CARRIER AND THEY FIXED ME WITH NO CHARGE,I WOULD DO THE SAME IF I WERE YOU
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