How to use Bitrix include areas correctly?

Question

1C-Bitrix

Good afternoon, I have a question, there is a phone number in the header of the site and in the footer, we are implementing an included area

<a href="tel:#" class="tel"><?$APPLICATION->IncludeFile(SITE_DIR.'include/telefon.php',array(),array('MODE' => 'text'))?></a>

at the same time, we connected to the header, but the link is not active . How to properly implement so that the area is edited in one place, but displayed in several places?
<a href="tel:#" class="tel">

Answer 1

It can be implemented in several ways:
1. Move the entire link to the include area. And we are already making it.
2. We take it to the COption settings (in our module, for example) and pull from them (they are cached
)