E750 EP-06E Mudi Mobile data roaming

I have two SIM cards a Three UK with go roam and an O2 with EU roaming.

How can I enable and disable mobile data roaming in general?

Occasionally I use ferry services that provide an expensive mobile service. Is there a way to whitelist or blacklist mobile networks?

You can turn off roaming using AT command.

Disable roaming
AT+QCFG="roamservice",1

Enable roaming
AT+QCFG="roamservice",2

Auto
AT+QCFG="roamservice",255
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