Andrew McGlashan wrote:
Optus should not be charging for 3G data when the data is going via WiFi. It is more likely that some app on the phone is using 3G regardless of WiFi being available.
How is that possible? I assumed phones had a conventional route table like 1.2.3/24 dev wlan0 src 1.2.3.4 0/0 via 1.2.3.1 or on 3G, 4.3.2.2 dev ppp0 src 4.3.2.1 0/0 via 4.3.2.2 Whereupon it would be impossible for a single app to "choose" the wrong interface -- unless each app has its own route table? Even if both interfaces are up (which would seem wasteful and unnecessary) and configured with wlan0 to have a preferential metric, how could a single app unilaterally circumvent that?
So, the currently available options from my provider don't suit for emergency calls or SMS. However, a "real" emergency call can be made without even having a SIM in a phone (000 calls).
I thought it was a different number for cellphones -- 122 or something.