app/views/devise/devise_authy/enable_authy.html.erb
<div class="devise_authy">
<h2><%= I18n.t('authy_register_title', scope: 'devise') %></h2>
<%= enable_authy_form do %>
<%= text_field_tag :country_code, '', autocomplete: :off, placeholder: I18n.t('devise.country'), id: "authy-countries" %>
<%= text_field_tag :cellphone, '', autocomplete: :off, placeholder: I18n.t('devise.cellphone'), id: "authy-cellphone" %>
<p><%= submit_tag I18n.t('enable_authy', scope: 'devise'), class: 'btn' %></p>
<% end %>
</div>