Hi. I get the message 'globalsign root ca not trusted ' on my iphone - any ideas please.

It means it is not recongnized as one of the preinstalled certificates on your iOS device. It means the certificate is not signed by a very well trusted certificate signer.

Apple lists the GlobalSign CA as a trusted rootCA on http://support.apple.com/kb/ht5012

Badgrammar, where are you seeing the root CA not trusted message? We are using globalsign certs just fine on webservers accessed through Safari - however we are getting a not trusted message when connecting to a wireless controller with a GlobalSign cert on it. Not sure if this is GlobalSign's issue or Apple's?