How to find out carrier's name in Android

You can Try following function and its return your SimOperatoerNumber.

TelephonyManager telephonyManager = (TelephonyManager) context
            .getSystemService(Context.TELEPHONY_SERVICE);

public String getSIMoperatorName() {
    return telephonyManager.getSimOperatorName();

}
Add below permission into your Androidmanifest.xml file.
< uses-permission android:name="android.permission.READ_PHONE_STATE"/>