virtualhost for intranet (no replies)

Hello,
I'm currently making a web site on my wamp, and I want to test the responsive css for this one.
I try to acces, with my phone, on my network (LAN, wifi both can se together), but I have 403 error with my phone.
The same for another PC.

Here is my configuration for wampserver host :Win7, wamp 3.2.0, apache 2.4.41.
While searching, I've seen that is in hhtpd-vhosts.conf that I may change values. When I change for localhost, it works (accessing via [ipadress] ). But it not allowed, I've undestood.

So, I try this :

<VirtualHost *:80>
ServerName gestion-photos
DocumentRoot "c:/wamp/www/gestdia"
<Directory "c:/wamp/www/gestdia/">
Options +Indexes +Includes +FollowSymLinks +MultiViews
AllowOverride All
Require all granted
</Directory>
</VirtualHost>

But it doesn't work at all (still 403 error).
And I don't know, from my phone, or another wich URL call.

Where am I wrong ?

Thanks for help.
Best regards,
Guillaume