How can I get the code to unlock my phone and to be able to use any sim card?
To unlock your Samsung D407:
1. Switch ON your Samsung D407 with a NOT ACCEPTED SIM Card.
2. Compose : #7465625*638*CODE# (or *#7465625*638*CODE#).
Each Samsung D407 mobile phone has an unique unlock code. You can buy the unique unlock code for your Samsung D407 mobile phone from www.mobileunlocksolutions.com or www.superunlockcodes.com.
Not accepted: A sim card from a network other than the network your Samsung D407 is locked to.
Code: Its the unique Unlock Code for your Samsung D407. source