There are a lot of ‘unsigned’ applications floating around the web, partly because part time developers either do not have the time or money to get their applications signed via the Symbian Signed program. While quite a bit of such applications can be signed via the Open Signed website.
For all such reasons it is best to have a developer certificate with which you can sign the files on the phone itself and install without having to bother with any other method.
HOW TO GET A CERTIFICATE FOR YOUR S60 DEVICE
Simply visit http://www.s60certkey.com/ and sign up for an account.
Sign up For A New Account
Just fill in your basic details
Verify Your Email
Go to your email and click on the provided
Input Your IMEI Number & Click On Submit
(If you don’t know your IMEI then press *#06# from your numberpad)
Wait For 12 – 24 Hours
After 12 – 24 Hours when you return back HERE your .cer and .key will be ready to download. ( You just need to click on them)
PS: I or the iPhoneFizz Team will not be responsible for any damage or liability that results from the use of the above tutorial. Please do so at your own risk.