res/values/config.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- persist APNs for these PLMNs on db upgrade to version 14 -->
    <string-array name="persist_apns_for_plmn">
        <item>20404</item>
        <item>310004</item>
        <item>310120</item>
        <item>311480</item>
    </string-array>

    <!-- The preferred APN to use, in the format name,mcc,mnc
         Leave empty to choose automatically. -->
    <string name="config_preferred_apn"></string>
</resources>