Нужно было срочно, а не было кабеля
Нашел на черном форуме:

Unlock your Samsung without a cable.
Just got my S307 tonight and had enough spare time to mess around and try to unlock it. Anyhow, this worked for my phone, and it seems like it should work for most Samsungs from what I've seen posted.

1. Turn off your phone, put in a SIM of a provider that it is not locked to, and turn it back on.
2. At the wrong card message, type *#9998*3323#. A message will pop up telling you to press exit, so hit the right softkey. Choose number 7 (or 8 or 9 work, I think). Your phone will reboot and your SIM will work.
3. Type *0141# and then hit call. This will give you a message saying your phone is personalized.
4. Power down your phone and insert a SIM card other than the one that is in it. Power back up your phone.
5. At the SIM code prompt type 00000000, that is 8 zeroes.

Your phone should now be unlocked. At least mine seems to be. Let me know how it goes. By the way, I stole all of this info from the threads below. I just kinda smashed it all together.