I find that, although the phone works and I can recieve text messages, I can't send them because the "text message service center" field is empty and if I enter anything in the box, it clears as soon as I leave the screen.
Also, trying to use the SIM manager (for contacts etc) returns the message "invalid or missing sim".
To me, this seems to be a semi-incompatible sim card. I've seen other phones with the same issue (eg here) so I don't think it's a specific phone/ROM issue. I've tried SDKCerts.cab and using a cab to install the network settings, neither worked.
Has anyone seen/fixed this before? Thanks.