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[inquisitor]

@ChrisNeedsToKnow
STK implementation has ever been quite buggy, especially when the STK application does odd things like resetting the SIM (which toggle does when the IMSI is being changed). Back in the days of United Mobile some phones even crashed when placing an outgoing call (which should have made the STK requesting a callback by USSD) while others simply aborted the call. Perhaps a firmware update can solve your issue.

[ronwi]

Google has an annoying security feature on Android phones- every time you change the SIM card, you have to log into Google again. So, no Gmail, no Play Store, etc. until you log back in.

Of course, Google sees and IMSI change as a change of SIM card.

This is a particular pain for people like myself who use two-step authentication. You have to use a non-memorable Google generated "application specific password."

[ChrisNeedsToKnow]

Originally Posted by inquisitor

@ChrisNeedsToKnow
STK implementation has ever been quite buggy, especially when the STK application does odd things like resetting the SIM (which toggle does when the IMSI is being changed). Back in the days of United Mobile some phones even crashed when placing an outgoing call (which should have made the STK requesting a callback by USSD) while others simply aborted the call. Perhaps a firmware update can solve your issue.

Thanks for the hint. The C2-00´s firmware is up-to-date. Luckily I only use it as a backup phone. I´d love to see an official "direct"-Google-Android-dual-SIM mobile, but I guess that will have to wait.

Over the weekend in Spain toogle worked like a charm. Incoming calls on my Swiss number reached me free of charge. It´s as if the EU´s plan to abolish roamingcharges was already true now, incl Switzerland

Last but not least I found out that my Samsung i9250 ("Galaxy Nexus") does not support STK, there´s simply no menu. However, changes made on the C2-00 seem to be saved on the SIM, so it´s just a matter of changing settings first, and swapping the SIM after. For me, not crossing the border every day, this is not great but acceptable.

I´m now looking for a solution to automate the toggle D/CH network switch for a friend from Konstanz/Germany, who crosses the border all the time. Switching manually every day would be a pain. He lives so close to the border that all networks (4German 3Swiss) are available. I hope this won´t dry the battery on automatic mode. Will report back with findings once I have them, but this will take a while...