What is Mobile Phone Brand and Model?You can try 1234 or 0000 for Nokia DCT Phones.If these code not work means you can get the master reset code for Alcatel Old Phones and Nokia DCT phones at Theunlockspot.com and reset it.
Unlocking will remove the Network Lock from Your I-phone.Without nlocking you cannot use other GSM Network Sim card.You can use the Remote Unlock service to Unlock it from network lock.Get Remote I-Phone unlock service from Onlinegsmunlock.com/apple-iphone/rs7wp9/ and Unlock it .After Unlocking use with any GSM Network Sim card.
try code from Online sites and Unlock it....
To Unlock Samsung SGH Z230 use the unlock code.You can get the Unlock code from the site Prounlocking.com/unlock-your-phone/rs8wp2/
and Unlock it from network lock step by step using the Unlocking instructions there.
Try code from service provider..
Use the Remote Unlock service to Unlock I-phone 4 from network lock.You can get that at Wickedunlock.com/apple-iphone-4/rs11wp9/
and Unlock it easily.