I was robbed in my house and they took my phones as well. My Nokia N91 is locked and I have some important information there( some official cause i use the phone sometimes in place of my laptop), will the robber have access to my files if he succeed in breaking the code? By the way when booting up you will have to enter two different security codes at two different stages before the phones is ready for use. Will breaking of the codes erase the files or will the robber have access to them, please I will appreciate a helpful information.

If the information you have on your phone is in your memory card,then your file is vulnerable if memory card not password protected. But if on phone memory,to break the code wud require professionality,but in naija we flash phones,n not break the code.
And flashin the phone would erase everything what soever on your phone,so your files can't be accessed.