partner-contact/partner_phone_secondary/views/res_partner.xml

<?xml version="1.0" encoding="utf-8" ?>
<!--
Copyright 2020 - Iván Todorovich
License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
-->
<odoo>

    <record id="view_partner_form" model="ir.ui.view">
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="base.view_partner_form" />
        <field name="priority" eval="1" />
        <field name="arch" type="xml">
            <field name="phone" position="after">
                <field name="phone2" widget="phone" />
            </field>
        </field>
    </record>

</odoo>