SailfisOS on a Sony Xperia™ 10

Can somebody else confirm/deny they have both sim cards working at 4G simultaneously?

PS Single 4G icon in status-bar means only 1 sim-card is on 4G.

So, nobody can confirm?

Also, disconnecting usb OTG adapter still (on 4.0) reboots X10.

I had successfully in use 2 SIM cards on 4G at the same time for many months. No problems visible. Sony Xperia 10 Dual SIM.

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How did you check that both cards are really on 4G at the same time?

Both sigmal indicators full signal and 4G indicated on display. No more precise information, I must confess…

this single 4G icon only means the signal for the “internet” sim. I have it too, displayed.
nonetheless, only this designated “internet” sim is on 4G, the other one is on 2G.

You can check current signal like this:

$ dbus-send --system --print-reply=literal --type=method_call --dest=org.ofono /ril_0 org.ofono.NetworkRegistration.GetProperties | grep Technology
$ dbus-send --system --print-reply=literal --type=method_call --dest=org.ofono /ril_1 org.ofono.NetworkRegistration.GetProperties | grep Technology

So in my case it shows this (4g for sim1 and 2g for sim2):

     Technology         variant             lte      )
     Technology         variant             gsm      )

Maybe one of your cards needs an update from your provider. Put it in an android phone for a day, that did it for me.

You probably missed my post higher - sim card selected as “default for internet” gets 4G, the other one gets 2G. They both can work as 4G (not simultaneously!) if I designate them as “Internet” one.