Semi-incompatible sim with new ROMs (can't send texts)...

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For background, my device is a c500 (typhoon) and I've tried various roms (but I'm using the 6.1 one atm). I didn't have this problem with the stock ROM.

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.

have you tried another sim?

not sure about your operator but mine always send me a new sim if i so request for free

Hmm. I tried an O2 sim - works fine. Maybe it's because my sim is 3G (and the phone isn't)?

Here's a similar thread on modaco that comes to the same conclusion. If anyone else has the same problem, this is probably the solution.

just trying my luck, is there another solution to this issue yet, orange uk wont send me a 2g sim for anything so im stuck

UPDATE:
For information orange wont send me a 3g sim as the handset i should have is a 3g phone so they dont want to know
unfortunately I cant keep the phone as its no good to me