How can I check whether the Sim Card is available in an android device?

Use TelephonyManager.

http://developer.android.com/reference/android/telephony/TelephonyManager.html

As Falmarri notes, you will want to use getPhoneType 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.

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;            }

EDIT:

Starting at API 26 (Android O Preview) you can query the SimState for individual sim slots by using getSimState(int slotIndex) ie:

int simStateMain = telMgr.getSimState(0);int simStateSecond = telMgr.getSimState(1);

official documentation

If you're developing with and older api, you can use TelephonyManager's

String getDeviceId (int slotIndex)//returns null if device ID is not available. ie. query slotIndex 1 in a single sim deviceint devIdSecond = telMgr.getDeviceId(1);//if(devIdSecond == null)// no second sim slot available

which was added in API 23 - docs here

You can check with the below code :

public static boolean isSimSupport(Context context)    {        TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);  //gets the current TelephonyManager        return !(tm.getSimState() == TelephonyManager.SIM_STATE_ABSENT);    }

Found another way to do this.

public static boolean isSimStateReadyorNotReady() {        int simSlotCount = sSlotCount;        String simStates = SystemProperties.get("gsm.sim.state", "");        if (simStates != null) {            String[] slotState = simStates.split(",");            int simSlot = 0;            while (simSlot < simSlotCount && slotState.length > simSlot) {                String simSlotState = slotState[simSlot];                Log.d("MultiSimUtils", "isSimStateReadyorNotReady() : simSlot = " + simSlot + ", simState = " + simSlotState);                if (simSlotState.equalsIgnoreCase("READY") || simSlotState.equalsIgnoreCase("NOT_READY")) {                    return true;                }                simSlot++;            }        }        return false;    }