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I was not able to get a free unlock code for the mobile model that you have specified.You can get the unique unlock code for your Samsung SGH-A437 from Wickedunlock.com and remove the network restriction.You need to specify the country,locked network,IMEI and get the unlock code along with free unlock instructions.
phone does not have a puk code, the puk code is on the sim card, if you take the sim card out and put in any other sim card the phone will work, but if you put this sim card back in it will ask for a puk code again.
You can ONLY obtain the puk code from the service provider that the sim card is from, they are the only people who can get you your puk code, since its unique, programmed into the sim card, we can't calculate it or get it, its the service provider you HAVE to contact.
Check the manual usually they are like 1111 1234 or 0000 by default. if that doesn't work try last 4 of phone number and this code *#8999*8378# - Service Menu should allow you to reset phone to default and fix the issue