Reply To: Phone number does not click In the header of the site

Hello lyuba,
You can replace the code by following code:
echo "<a class='top-phone' href='tel:".esc_attr( esc_html( $education_base_phone_number ))."'><i class='fa fa-phone'></i>".esc_html( $education_base_phone_number )."</a>";

Please note that using child theme is recommended to customize the theme.

Best Regards!
Acme Themes