device/drawable-anydpi-v21/ic_signal_cellular_null_black_24dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M20,6.83V20H6.83L20,6.83M22,2L2,22h20V2z"/>
</vector>