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[inquisitor]

I don't think IMSI selection is based on trial and error. While or before your phone tries to register on a certain network it must somehow submit the network's MCC/MNC-tuple to the SIM card because all the authentication stuff happens in the SIM card. That's where the STK application running on the SIM card comes in and decides to switch IMSIs if the requested MCC is from a country where another IMSI should be used. Of course the selection will be somehow unpredictable when you are in an border area where there are networks from multiple countries available.

[ChrisNeedsToKnow]

On my Nokia C2-00 automatic selection doesn´t seem to work at all.

On selecting anything in the STK (automatic, or one of the IMSIs), the phone crashes. After restarting, the selection I made comes into effect. However, when selecting "automatic" the phone doesn´t register in any network. Neither on manual nor automatic network selection.

As such I just select everything manually, and I don´t really mind about that. I guess that´s because of the phone.

[ronwi]

Which country are you in?

From what I've read here (and my own experience), in the Toggle countries it will only register on the localized IMSI for the country you are in. If you are not in one of the Toggle countries, it will only register on the roaming IMSI.

Originally Posted by ChrisNeedsToKnow

On my Nokia C2-00 automatic selection doesn´t seem to work at all.

On selecting anything in the STK (automatic, or one of the IMSIs), the phone crashes. After restarting, the selection I made comes into effect. However, when selecting "automatic" the phone doesn´t register in any network. Neither on manual nor automatic network selection.

As such I just select everything manually, and I don´t really mind about that. I guess that´s because of the phone.

[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...