Why you should hack your symbian phone
1. It allows you to install all applications whether it’s signed or not.
2. After hacking your symbian, you’ll definitely stop seeing errors like “certicate error” during installation.
3. It allows you to install applications with expired certificates.
Download required application HERE.

Procedure
1. Install Norton SymbianHackLDD.sis (Symantec Symbian Hack).
2. Launch the application.
3. Go to Antivirus » Quarantine List.
4. You should see 4 files listed in Quarantine, now go to options Restore All. Select Yes, now you’ve done with Norton you can uninstall it from your phone if you want.
5. Install RomPatcher Plus_3.1_LiteVersion and launch. Click on both patches to apply them and the blue icons beside them should turn green.
Then Applying Installserver patch, the icon might change to a red cross. This is where the "installserver.exe" in the pack you donwloaded comes inside. Now select each of them and go to Options » Add to Auto.
6. Install x- plore_s60_3rd_1_56.sisx and launch.
7. Press 0 and check the first four boxes.
8. Now copy that installserver in the pack you download to C:\sys\bin.
To complete the whole process, restart your phone. Your phone is now been hacked. You should now be able to install any unsigned apps on your hacked symbian phone!