Overcoming Certificate Error phone symbian v3

When looking to install new applications on mobile symbian v3, you may never find the message "certificate error, contact the dealer etc ..." or in other words "Certificate Error - Contact the application supplier". This occurs because the applications would be installed instead of applications that signed, it appears is the error message. To overcome this there is one simple tips you can do.

Go to Menu → Tools → App. Manager → Options → Settings → Software installation -then change to "All", then restart (power off and on again) your phone. Good luck