Drupal twig template if mobile

Question

Ok, I am trying to develop drupal template and I need to tell you that I did not really understand how to use the If mobile.

{% if is_mobile() %}
{{ page.content }}
{% endif %}

I thought that this was working but I have errors.

i have also tried this

{% if is_mobile() %}
{% include '@header.html.twig' %}
{% endif %}

but is not working... so what I need to do?

Answer 1

Ok, I found the problem.

The problem was that mobile_detect module was not installed properly for some reason.

Sorry to everybody