On Socioh you can control exactly where your ad is finally displayed. You can choose between the following options
Desktop & Mobile: Your ad will be visible to people using Facebook/Instagram from their desktop and on their mobile.
Desktop: Your ad will be visible only to people using Facebook/Instagram from their desktop computers.
Mobile: Your ad will be visible only to people using Facebook/Instagram on their mobile devices.
If you want to run an ad only on mobile devices, simply choose
Edit Placement option while creating your ad.