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Dual SIM card

I'm trying to write a program that changes the default SIM card on my Android simulate, what functions do I need for this?

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The Android SDK does not support the manipulation of multiple SIM cards. You will need to contact the manufacturer of your device and ask them if they have an SDK add-in or something that allows you to work with multiple SIM cards.

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If your phone is based on Mediatek, there is a way to do what you want. Do not doubt it.

Dual SIM Switch Widget (I developed it) is able to manage SIM states on most two SIM cards with Mediatek boards.

Take a look at this page: http://labs.mediatek.com/site/global/developer_tools/mediatek_android/api_references/mediatek-sdk3/reference/com/mediatek/telephony/TelephonyManagerEx.gsp

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