+CEREG signals denied before being registered

[Sven Schwermer]

Hi,

I have another question about the Fibocom MA510-GL: When +COPS=0 is 
issued, often the modem emits the following sequence of URC which makes 
ModemManager abort the simple connect flow:

+CEREG: 0 (idle)
+CEREG: 2 (searching)
+CEREG: 3 (denied)
+CEREG: 5,... (registered, roaming)

I guess this might not be in accordance with the specs, but I'm not 
sure. It also doesn't always do that but when it does it jumps from 
denied to registered within seconds. What would be an acceptable way to 
handle this?

Best regards,
Sven