1. 在AndroidManifest.xml中添加权限

添加以下权限到AndroidManifest.xml中：

2. 签名应用

确保应用已被正确签名。

3. 检查设备

检查是否设备支持ICC，并且已安装正确的SIM卡。

4. 检查运营商

检查是否运营商支持ICC，启用并激活了SIM卡。

示例代码：

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_ICC_AUTH_WITH_DEVICE_IDENTIFIER) == PackageManager.PERMISSION_GRANTED) {
  // Permission is granted
} else {
  // Permission is not granted, request for permission
  ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.USE_ICC_AUTH_WITH_DEVICE_IDENTIFIER}, REQUEST_CODE);
}

// Check if the device has ICC and SIM
TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
if (telephonyManager.getSimState() == TelephonyManager.SIM_STATE_READY) {
  // SIM card is ready
  if (telephonyManager.hasIccCard()) {
    // Device has ICC
  } else {
    // Device does not have ICC
  }
} else {
  // SIM card not found or not ready
}

// Checking if network is available
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo == null || !networkInfo.isConnected()) {
  // Network not available
} else {
  // Network is available
}