FWIW - I've been having exactly the same problem with a brand new Lumia 930, so don't think this is a "developer preview" issue.
In my case, I went into the Three store today to ask about this before seeing this thread. They spoke to their support and were told to try a different SIM in the phone, which worked fine. Consequently, they suggested a SIM swap, so I'm currently waiting for the old SIM to deactivate so I can try the new one. However, neither the helpful guy in the shop or I am supremely confident this will work!
What is slightly odd is that before my 930 arrived, I had used the SIM in my 920 (which had the dev preview) and it seemed to be fine. That said, I got the SIM on Tuesday, ported my old number on Wednesday and then got the 930 on Thursday, so only have a couple of days of "it working" to go on.
Assuming the new SIM doesn't help, then at least I can refer to this thread to let them know that they do have a known problem that they should be able to fix!
In my case, I went into the Three store today to ask about this before seeing this thread. They spoke to their support and were told to try a different SIM in the phone, which worked fine. Consequently, they suggested a SIM swap, so I'm currently waiting for the old SIM to deactivate so I can try the new one. However, neither the helpful guy in the shop or I am supremely confident this will work!
What is slightly odd is that before my 930 arrived, I had used the SIM in my 920 (which had the dev preview) and it seemed to be fine. That said, I got the SIM on Tuesday, ported my old number on Wednesday and then got the 930 on Thursday, so only have a couple of days of "it working" to go on.
Assuming the new SIM doesn't help, then at least I can refer to this thread to let them know that they do have a known problem that they should be able to fix!