If Vodafone Italy sim is in Spain consider it as roaming on Spain nw.

    <string-array translatable="false" name="config_tether_apndata">

      <item>Tethering Internet,web.omnitel.it,,,,,,,,,222,10,,DUN</item>

    </string-array>

    <string-array translatable="false" name="config_operatorConsideredNonRoaming">

        <item>21401</item>

        <item>21402</item>

        <item>21403</item>

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        <item>21418</item>

        <item>21419</item>

        <item>21420</item>

        <item>21421</item>

    </string-array>

</resources>