How to enter codes into samsung phone

I am trying to enter a code into my samsung e2250 so I may change my operator logo, but I don't know where to type in the code and what to press after you type in the code, Please help somebody

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Are you trying to unlock your phone for another network or just make it look different.

I am trying to remove the operator logo with a samsung code I got, but I am unsure as where to type this code and what to press after it. I already have it unlocked.

once you sign it up for a different carrier it will change the operator logo for instance if it a t-mobile unlocked phone you can put a simple mobile sim in it and the logo will change to Simple Mobile

It phone was with vodafone and I got it unlocked to use o2, it's connected ok to o2 network but vodafone splash screen logo is still there. But I have not registered the phone with o2 yet.

not that familiar with either one of those companies I just know that when I switch peoples carriers it always changes the carrier logo maybe when you reg. I have no idea of what or where to program. I know some android phones you can reprogram to say perferred customers. Sorry couldnt be more help good luck.

Thank you for help.