ok another method of hacking your nokia v3 phones surfaced some weeks back. u can now install unsigned apps without the certificate brohaha directly on your phones without the aid of PC. follow this simple steps below and u are as good as kissing signing apps goodbye. NOTE! u do this at your own risk which invoves voiding your waranty
You need to install X-plore. Now install HelloCarbide.sisx. I installed both to Phone Memory.
Run X-plore.
Go to C: Try to access c:sys . . . It should do nothing.
DO NOT CLOSE X-plore.
Run HelloCarbide press Options: Menu1: you will see 'Done, probably', Click Yes and then it will crash.
Switch to X-plore.
Try again to access c:sys
It should work.
Now copy installserver.exe to c:sys/bin/ NOTE! u have to copy the proper one for your phone ie for os 9.1 and os 9.2
You need to restart your phone.
Now you can install any 'Unsigned' app without signing.