Network information can't be updated dynamically

[Li, Zhigang]

Hi,
I take a phone as modem to use ofono and find the network information can't be updated dynamically in ofono: so the network status always is roaming.
Because ofono get the response is roaming status at beginning.
  ofonod[10503]:  Response line: +CREG: 2,5,"188E","00006302"

The network status and signal strength will update dynamically but ofono can't receive it automatically because modem can't send it regular. or anything wrong in my understanding?

Can ofono send the CREG command regular to get the network information look like COPS command?

If we expect application to initialize this request then which interface for it?
Get properties and properties_changed can't get the updated information so far.

Thanks