blocks|key|2525625|text|有三个不同的类别...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2525626|支持的|2525627|功能和可用的documented|ordered-list-item|2525628|Features以及不可用的un-documented|2525629|features+|2525630|2525631|因此，双sim功能是可用的，但没有文档记录，因此没有得到官方支持。|2525632|话虽如此，但这并不意味着它将无法使用，它只是意味着android(或者就这一点而言，谷歌甚至是manufaturer)不会支持你的应用功能。|2525633|但它可能只是工作，因为例如，联系人是类似的事情。|2525634|然后你可能会问，如果没有文档记录，每个人如何知道这些功能。嘿，android是开源的..去看看代码，自己去找吧。我猜这就是多sim开发人员所做的。|2525635|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|Z|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|11|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|12|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|13|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|14|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|U|$]]

there are 3 different categories ... 

<ol>
<li>features supported and documented</li>
<li>Features available and un-documented</li>
<li>features unavailable</li>
</ol>

So the dual sim features are available but not documented and hence not officially supported.

Having said that it doesn't mean that it will not be usable , It just means that android(or for that matter google or even manufaturer) is not liable to support your apps functionality.

But it might just work , for eg the contacts is a similar thing.

You might then ask up how would everyone know about the features if in case its not documented.. Hey android is open source .. go look into code and find it for yourself . Thats what I guess the multi sim developers did.

blocks|key|46819|text|+<receiver
+++++android:name=".SimChangedReceiver"
++++android:enabled="true"
++++android:process=":remote"+>
++++<intent-filter>
++++++++<action+android:name="android.intent.action.SIM_STATE_CHANGED"+/>
++++</intent-filter>
++++<intent-filter>
++++++++<action+android:name="android.intent.action.BOOT_COMPLETED"+/>
++++</intent-filter>
+</receiver>

SimChangedReceiver+class

public+class+SimChangedReceiver+extends+BroadcastReceiver+{

public+void+onReceive(Context+context,+Intent+intent)+{
++++String+action+=+intent.getAction();
++++if+(action.equalsIgnoreCase("android.intent.action.SIM_STATE_CHANGED"))+{
++++++++Log.d("SimChangedReceiver",+"-->+SIM+state+changed+<--");+++

++++++//++++++++++++do+code++whatever+u+want+to+apply+action++++++++++++++++//

++++}
+++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|46820|这也适用于dual+sim，您不需要调用此接收器，因为它将远程运行|unstyled|46821|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code> &lt;receiver
 android:name=".SimChangedReceiver"
 android:enabled="true"
 android:process=":remote" &gt;
 &lt;intent-filter&gt;
 &lt;action android:name="android.intent.action.SIM_STATE_CHANGED" /&gt;
 &lt;/intent-filter&gt;
 &lt;intent-filter&gt;
 &lt;action android:name="android.intent.action.BOOT_COMPLETED" /&gt;
 &lt;/intent-filter&gt;
 &lt;/receiver&gt;

SimChangedReceiver class

public class SimChangedReceiver extends BroadcastReceiver {

public void onReceive(Context context, Intent intent) {
 String action = intent.getAction();
 if (action.equalsIgnoreCase("android.intent.action.SIM_STATE_CHANGED")) {
 Log.d("SimChangedReceiver", "--&gt; SIM state changed &lt;--"); 

 // do code whatever u want to apply action //

 }
 }
}
</code></pre>

this is work for dual sim also , and you don't need to call this receiver because it will run remotely

blocks|key|47312|text|在API+22之前，Android不支持多个SIM卡功能。但是从Android+5.1+(API+level+22)开始，Android开始支持多个SIMs。有关Android+Documentation的更多详细信息|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|47313|来自此Original+Answer的引用|47314|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/reference/android/telephony/SubscriptionManager.html#getActiveSubscriptionInfoList%2528%2529|1|https://stackoverflow.com/questions/7996197/detect-the-status-of-two-sim-cards-in-a-dual-sim-android-phone^0|29|L|0|0|3|F|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

Android does not support multiple SIM features before API 22. But from Android 5.1 (API level 22) onwards, Android started supporting multiple SIMs. More details on <a href="https://developer.android.com/reference/android/telephony/SubscriptionManager.html#getActiveSubscriptionInfoList%28%29" rel="nofollow noreferrer">Android Documentation</a>

Reference from this <a href="https://stackoverflow.com/questions/7996197/detect-the-status-of-two-sim-cards-in-a-dual-sim-android-phone">Original Answer</a>

blocks|key|2525806|text|您可以使用MultiSim库来获取多卡设备的详细信息。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2525807|来自每个SIM卡的可用信息:+IMEI、IMSI、SIM序列号、sim状态、SIM运营商代码、SIM运营商名称、SIM国家iso、网络运营商代码、网络运营商名称、网络运营商iso、网络类型、漫游状态。|2525808|只需在您的应用级Gradle脚本中添加以下行：|2525809|dependencies+{
++++compile+'com.kirianov.multisim:multisim:2.0@aar'
}|code-block|syntax|javascript|2525810|别忘了在AndroidManifest.xml中添加所需的权限：|2525811|<uses-permission+android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission+android:name="android.permission.READ_PHONE_STATE"/>|2525812|在代码中使用类似的代码：|2525813|MultiSimTelephonyManager+multiSimTelephonyManager+=+new+MultiSimTelephonyManager(this);
//+or
MultiSimTelephonyManager+multiSimTelephonyManager+=+new+MultiSimTelephonyManager(this,+new+BroadcastReceiver()+{
++@Override
++public+void+onReceive(Context+context,+Intent+intent)+{
++++updateInfo();
++}
});


public+void+updateInfo()+{

++//+for+update+UI
++runOnUiThread(new+Runnable()+{
++++@Override
++++public+void+run()+{
++++++multiSimTelephonyManager.update();
++++++useInfo();
++++}
++}

++//+for+update+background+information
++multiSimTelephonyManager.update();
++useInfo();
}

public+void+useInfo()+{

++//+get+number+of+slots:
++if+(multiSimTelephonyManager+!=+null)+{
+++++multiSimTelephonyManager.sizeSlots();
++}

++//+get+info+from+each+slot:
++if+(multiSimTelephonyManager+!=+null)+{
++++for(int+i+=+0;+i+<+multiSimTelephonyManager.sizeSlots();+i%2B%2B)+{
++++++multiSimTelephonyManager.getSlot(i).getImei();
++++++multiSimTelephonyManager.getSlot(i).getImsi();
++++++multiSimTelephonyManager.getSlot(i).getSimSerialNumber();
++++++multiSimTelephonyManager.getSlot(i).getSimState();
++++++multiSimTelephonyManager.getSlot(i).getSimOperator();
++++++multiSimTelephonyManager.getSlot(i).getSimOperatorName();
++++++multiSimTelephonyManager.getSlot(i).getSimCountryIso();
++++++multiSimTelephonyManager.getSlot(i).getNetworkOperator();
++++++multiSimTelephonyManager.getSlot(i).getNetworkOperatorName();
++++++multiSimTelephonyManager.getSlot(i).getNetworkCountryIso();
++++++multiSimTelephonyManager.getSlot(i).getNetworkType();
++++++multiSimTelephonyManager.getSlot(i).isNetworkRoaming();
++++}
++}
}

//+or+for+devices+above+android+6.0
MultiSimTelephonyManager+multiSimTelephonyManager+=+new+MultiSimTelephonyManager(MyActivity.this,+broadcastReceiverChange);|2525814|用法：|2525815|//+get+info+about+slot+'i'+by+methods:
multiSimTelephonyManager.getSlot(i).|2525816|强制更新信息：|2525817|//+force+update+phone+info+(needed+on+devices+above+android+6.0+after+confirm+permissions+request)
multiSimTelephonyManager.update();|2525818|权限请求句柄(6.0%2B)：|2525819|//+in+YourActivity+for+update+info+after+confirm+permissions+request+on++devices+above+android+6.0
@Override
public+void+onRequestPermissionsResult(int+requestCode,+String[]+permissions,+int[]+grantResults)+{
++++super.onRequestPermissionsResult(requestCode,+permissions,+grantResults);
++++if+(multiSimTelephonyManager+!=+null)+{
++++++++multiSimTelephonyManager.update();
++++}
}|2525820|entityMap^0|5|8|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1D|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1E|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1F|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1G|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1H|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|1I|8|@]|D|@]|E|$]]|$1|U|3|V|5|L|7|1J|8|@]|D|@]|E|$M|N]]|$1|W|3|X|5|6|7|1K|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|L|7|1L|8|@]|D|@]|E|$M|N]]|$1|10|3|11|5|6|7|1M|8|@]|D|@]|E|$]]|$1|12|3|13|5|L|7|1N|8|@]|D|@]|E|$M|N]]|$1|14|3|15|5|6|7|1O|8|@]|D|@]|E|$]]|$1|16|3|17|5|L|7|1P|8|@]|D|@]|E|$M|N]]|$1|18|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]]|19|$]]

You can use <code>MultiSim</code> library to get details from multi-sim devices.

Available info from each sim card: IMEI, IMSI, SIM Serial Number, SIM State, SIM operator code, SIM operator name, SIM country iso, network operator code, network operator name, network operator iso, network type, roaming status.

Just add the lines below in your app-level Gradle script:

<pre><code>dependencies {
 compile 'com.kirianov.multisim:multisim:2.0@aar'
}
</code></pre>

Don't forget add required permission in AndroidManifest.xml:

<pre><code>&lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/&gt;
&lt;uses-permission android:name="android.permission.READ_PHONE_STATE"/&gt;
</code></pre>

Use similar code in your code:

<pre><code>MultiSimTelephonyManager multiSimTelephonyManager = new MultiSimTelephonyManager(this);
// or
MultiSimTelephonyManager multiSimTelephonyManager = new MultiSimTelephonyManager(this, new BroadcastReceiver() {
 @Override
 public void onReceive(Context context, Intent intent) {
 updateInfo();
 }
});


public void updateInfo() {

 // for update UI
 runOnUiThread(new Runnable() {
 @Override
 public void run() {
 multiSimTelephonyManager.update();
 useInfo();
 }
 }

 // for update background information
 multiSimTelephonyManager.update();
 useInfo();
}

public void useInfo() {

 // get number of slots:
 if (multiSimTelephonyManager != null) {
 multiSimTelephonyManager.sizeSlots();
 }

 // get info from each slot:
 if (multiSimTelephonyManager != null) {
 for(int i = 0; i &lt; multiSimTelephonyManager.sizeSlots(); i++) {
 multiSimTelephonyManager.getSlot(i).getImei();
 multiSimTelephonyManager.getSlot(i).getImsi();
 multiSimTelephonyManager.getSlot(i).getSimSerialNumber();
 multiSimTelephonyManager.getSlot(i).getSimState();
 multiSimTelephonyManager.getSlot(i).getSimOperator();
 multiSimTelephonyManager.getSlot(i).getSimOperatorName();
 multiSimTelephonyManager.getSlot(i).getSimCountryIso();
 multiSimTelephonyManager.getSlot(i).getNetworkOperator();
 multiSimTelephonyManager.getSlot(i).getNetworkOperatorName();
 multiSimTelephonyManager.getSlot(i).getNetworkCountryIso();
 multiSimTelephonyManager.getSlot(i).getNetworkType();
 multiSimTelephonyManager.getSlot(i).isNetworkRoaming();
 }
 }
}

// or for devices above android 6.0
MultiSimTelephonyManager multiSimTelephonyManager = new MultiSimTelephonyManager(MyActivity.this, broadcastReceiverChange);
</code></pre>

Usage:

<pre><code>// get info about slot 'i' by methods:
multiSimTelephonyManager.getSlot(i).
</code></pre>

Force update info:

<pre><code>// force update phone info (needed on devices above android 6.0 after confirm permissions request)
multiSimTelephonyManager.update();
</code></pre>

Handle of permissions request (6.0+):

<pre><code>// in YourActivity for update info after confirm permissions request on devices above android 6.0
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
 super.onRequestPermissionsResult(requestCode, permissions, grantResults);
 if (multiSimTelephonyManager != null) {
 multiSimTelephonyManager.update();
 }
}
</code></pre>

blocks|key|2525840|text|您可以使用SubscriptionInfo类来实现它，|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2525841|++++if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.LOLLIPOP_MR1)+{
++++++++val+mSubscriptionManager+=+getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE)+as+SubscriptionManager
++++++++//+val+mSubscriptionManager+=+SubscriptionManager.from(baseContext)
++++++++if+(ActivityCompat.checkSelfPermission(this,+Manifest.permission.READ_PHONE_STATE)+==+PackageManager.PERMISSION_GRANTED)+{
++++++++++++val+subscriptions+=+mSubscriptionManager.activeSubscriptionInfoList
++++++++//loop+through+number+of+SIMS+inserted
++++++++++++for+(subscriptionInfo+in+subscriptions)+{
++++++++++++++++//the+number+of+this+subscription+if+the+calling+app+has+been+granted+the+READ_PHONE_NUMBERS+permission,+or+an+empty+string+otherwise
++++++++++++++++Log.v("SIM",+subscriptionInfo.number)
++++++++++++++++//the+ISO+country+code
++++++++++++++++Log.v("SIM",+subscriptionInfo.countryIso)
++++++++++++++++//the+name+displayed+to+the+user+that+identifies+Subscription+provider+name
++++++++++++++++Log.v("SIM",+subscriptionInfo.carrierName.toString())
++++++++++++++++//the+name+displayed+to+the+user+that+identifies+this+subscription
++++++++++++++++Log.v("SIM",+subscriptionInfo.displayName.toString())
++++++++++++++++//The+MCC,+as+a+string.+This+value+may+be+null.
++++++++++++++++if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.Q)+{
++++++++++++++++++++Log.v("SIM",+subscriptionInfo.mccString.toString())
++++++++++++++++}+else+{
++++++++++++++++++++Log.v("SIM",+subscriptionInfo.mcc.toString())
++++++++++++++++}
++++++++++++++++//The+MNC,+as+a+string.+This+value+may+be+null.
++++++++++++++++if+(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.Q)+{
++++++++++++++++++++Log.v("SIM",+subscriptionInfo.mncString.toString())
++++++++++++++++}+else+{
++++++++++++++++++++Log.v("SIM",+subscriptionInfo.mnc.toString())
++++++++++++++++}
++++++++++++}
++++++++}
++++}|code-block|syntax|javascript|2525842|entityMap^0|5|G|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You can use <code>SubscriptionInfo</code> class to achieve it,
<pre><code> if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.LOLLIPOP_MR1) {
 val mSubscriptionManager = getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE) as SubscriptionManager
 // val mSubscriptionManager = SubscriptionManager.from(baseContext)
 if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED) {
 val subscriptions = mSubscriptionManager.activeSubscriptionInfoList
 //loop through number of SIMS inserted
 for (subscriptionInfo in subscriptions) {
 //the number of this subscription if the calling app has been granted the READ_PHONE_NUMBERS permission, or an empty string otherwise
 Log.v(&quot;SIM&quot;, subscriptionInfo.number)
 //the ISO country code
 Log.v(&quot;SIM&quot;, subscriptionInfo.countryIso)
 //the name displayed to the user that identifies Subscription provider name
 Log.v(&quot;SIM&quot;, subscriptionInfo.carrierName.toString())
 //the name displayed to the user that identifies this subscription
 Log.v(&quot;SIM&quot;, subscriptionInfo.displayName.toString())
 //The MCC, as a string. This value may be null.
 if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.Q) {
 Log.v(&quot;SIM&quot;, subscriptionInfo.mccString.toString())
 } else {
 Log.v(&quot;SIM&quot;, subscriptionInfo.mcc.toString())
 }
 //The MNC, as a string. This value may be null.
 if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.Q) {
 Log.v(&quot;SIM&quot;, subscriptionInfo.mncString.toString())
 } else {
 Log.v(&quot;SIM&quot;, subscriptionInfo.mnc.toString())
 }
 }
 }
 }
</code></pre>

There are several questions about accessing dual SIM features through the Android SDK, all of which are answered with brief statements that such features are unsupported in Android.

In spite of this, dual SIM phones do exist, and applications like <a href="https://play.google.com/store/apps/details?id=de.qianqin.multisim&amp;hl=en">MultiSim</a> seem to be able to detect this in some kind of manufacturer-independent way.

So, beginning with that acknowledgement, let me try to ask some more pointed questions:

<ul>
<li>Does "Android SDK does not support multiple SIM features" mean that these features do not exist, or that it is merely a bad idea to try to use them?</li>
<li>Is there an Android content provider or an internal package (com.android...) that provides SIM card information? (TelephonyManager, as far as I can see in the docs and the code, has no mention of multiple SIM cards)</li>
<li>Is there any report of any manufacturer exposing multiple SIM features to developers?</li>
<li>If I were to look for undocumented functionality from a manufacturer, how would I go about that?</li>
</ul>

(By the way, the point of all of this is merely to implement this algorithm: send an SMS with SIM card 1; if delivery fails, switch to SIM card 2 and resend the message that way.)

Android dual SIM card API

Android

Kotlin

通过Android SDK访问双卡功能有几个问题，所有问题都以简短的声明回答，Android不支持双卡功能。尽管如此，双SIM卡手机确实存在，像这样的应用程序似乎能够以某种独立于制造商的方式检测到这一点。因此，从承认开始，让我试着问一些更有针对性的问题： "Android SDK不支持多个SIM卡功能“是否意味着这些功...

问Android双SIM卡API
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