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    <p>Use TelephonyManager.</p> <p><a href="http://developer.android.com/reference/android/telephony/TelephonyManager.html" rel="noreferrer">http://developer.android.com/reference/android/telephony/TelephonyManager.html</a> </p> <p>As Falmarri notes, you <em>will</em> want to use <em>getPhoneType</em> FIRST of all, to see if you are even dealing with a GSM phone. If you are, then you can also get the SIM state. </p> <pre><code>TelephonyManager telMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE); int simState = telMgr.getSimState(); switch (simState) { case TelephonyManager.SIM_STATE_ABSENT: // do something break; case TelephonyManager.SIM_STATE_NETWORK_LOCKED: // do something break; case TelephonyManager.SIM_STATE_PIN_REQUIRED: // do something break; case TelephonyManager.SIM_STATE_PUK_REQUIRED: // do something break; case TelephonyManager.SIM_STATE_READY: // do something break; case TelephonyManager.SIM_STATE_UNKNOWN: // do something break; } </code></pre> <hr> <p><strong>EDIT:</strong></p> <p>Starting at API 26 (<em>Android O Preview</em>) you can query the SimState for individual sim slots by using <code>getSimState(int slotIndex)</code> ie:</p> <pre><code>int simStateMain = telMgr.getSimState(0); int simStateSecond = telMgr.getSimState(1); </code></pre> <p><a href="https://developer.android.com/reference/android/telephony/TelephonyManager.html#getSimState(int)" rel="noreferrer">official documentation</a></p> <p>If you're developing with and older api, you can use <code>TelephonyManager's</code></p> <pre><code>String getDeviceId (int slotIndex) //returns null if device ID is not available. ie. query slotIndex 1 in a single sim device int devIdSecond = telMgr.getDeviceId(1); //if(devIdSecond == null) // no second sim slot available </code></pre> <p>which was added in API 23 - docs <a href="https://developer.android.com/reference/android/telephony/TelephonyManager.html#getDeviceId(int)" rel="noreferrer">here</a></p>
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    1. COthanks for your answer,let me know how to check whether the phone number entered is valid from phone directory
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    2. COHow does this work for dual SIM devices?
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