What certificates should I use to sign my MIDlet?
You can sign your MIDlet with any certificate available on the target devices and allowing the Java Application installation. (You can check what certificates are available on the device through security settings – make sure the certificate you are thinking to use is set to allow Java application signing). The Java Verified certificate is widely available on devices from all manufacturers. Your MIDlet will be signed with this certificate after it passes the Java Verified testing. The testing criteria is available at Java Verified Web site (http://www.javaverified.com).