Usually when you purchase a phone from any network it usually locked to the operators. That is the main problem when you want to use the phone abroad with other operators. Luckily for Samsung SGH-i900 Omnia, you can unlock it for FREE of charge while other require purchasing unlock code from unlocking websites. You may follow the steps below to unlocked it.

- Go to the registry, HKCU\System\State\PHONE, and wrote down the first 6 digits of the value of the IMSI entry.”if u don’t have a registry edit just download this file and install it in ur phone “
- Type *7465625*638*#
- Type the first 6 digits of the value of the IMSI entry here.enter valid MCC/MNC http://en.wikipedia.org/wiki/Mobile_Network_Code “. I’ve use for example for sfr france 208103 normally it’s 20810 but u have to add a number from 0 to 9 if 5 digit give u Fail to setup lock
- Type your new NCK (12345678), then OK
- Type *#7465625# to check your lock (Network lock still enabled)
- Type #7465625*638*# and type your NCK (12345678)
Good luck!
Source: srimeenakshimobiles
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hi there i have got as for as putting in the MCC/MNC and have tryed it but it just ses sim failiure error i tryed adding the extra number like you sed but still the same could you pleas help me out meny thanks dan