You can bypass the cert thing on S60, but it's better to just install the cert (you can, I had to...our CA's certs didn't come with WinMobile or S60 either). You want to save the CA's certificate .cer file in DER encoded X.509 format, transfer it to the S60 device, and then just open it in file manager and it'll import it fine. WinMobile prefers Base64 encoded .cer files.