I have so far succesfully made three Supersims, 1 for myself and two for friends and have, as yet, not had this problem.
I know I have read of others having had this exact same problem but cannot, for the life of me, find the thread.
Does anyone know what it is likely to mean when everything else seems to go fine, until after activation with iActivator with new ICCID, I get "connecting to AT&T, may take some time" etc etc, then the dreaded "No Signal"?
I'm really stuck, have redone the process several times always with the same result>

Please help!

best to start over.

1. restore the phone
2. create a new supersim with sim emu using freshly downloaded copies of the iphone sim flash and eprom bases
3. rewrite the silvercard
4. jailbreak with the latest iactivator, then put the pem.
5. generate activation then activate.

you know, basically start again to ensure you're not doing something silly

Wombat:
Yep, reckon your probably right.
Back to square one.
Do you really feel that "freshly downloaded copies of the iphone sim flash and eprom bases" are neccesary?
Have they changed much? I've used the same ones a few times over, but didn't imagine they'd run dry!?
Thanks again For all your help.