How to Check Whether the Sim Card Is Available in an Android Device

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;
            }

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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 device

int devIdSecond = telMgr.getDeviceId(1);

//if(devIdSecond == null)
// no second sim slot available

which was added in API 23 - docs here

How to check the numbers of SIM in android device

You can use TelephonyInfo to get details of the dual sim phone.

for better explanation, have a look at this post.

Android : Check whether the phone is dual SIM

How to check if the Android Tablet has simcard feature programatically?

You have to play around with TelephoneyManager to test if it has simcard slot or not .
to be exect try below code. more details from here

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);

    }

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