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I'm new to Android and programming so I have been working on an app that can send USSD requests and sending calls and messages so far everything is working just fine. But the main issue is when I deployed it to a dual SIM phone it just reads the first one and completely ignores the second one . How can I send requests from both SIM cards and know which sim is in number and which sim is in two ? Thanks in advance.

Abdullah Ali
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if your API level is >22 ie marshmallow or higher, you can check for multiple SIMs using SubscriptionManager's method getActiveSubscriptionInfoList(). getDefaultDataSubscriptionId() would tell you what sim is active. More details on Android Docs.

Here is a better answer to help you check whether the phone is dual sim and also device specific issues(Samsung/karbonn etc)

Karan Harsh Wardhan
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