Has anyone had experience with programming the selection of the SIM card, when the phone uses a dual SIM adapter?
Thanks, STeN
Added later: I have found the MultiSim application on the Android Market, which has in its description written that "...Analog dual-sim-adapter users can switch their sim cards...", so is there some API in the Android SDK, which allows the SIM card switch/selection?
You have to go in settings. Then, find out simcard manager. In it you will get two simcards on display, from them choose the sim which you want to turn off. As soon as you touch that preferred sim there will be an option of on and off.
The current Android platform does not have support for multiple SIMs. A device with such support has been customized for this, so you will need to get information from that device's manufacturer for any facilities they have to interact with it.
Since nobody mentioned it yet, Android finally has added official multisim support on Android 5.1.
But unless your app is only targeting that API (which is currently less than 0.5% of the market) you are on your own with the more obscure solutions mentioned in the other answers.
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