theme for mobile phone classifieds website

good evening ,

i am developing a classifieds ads website for the sale of cellphone / mobile devices ;can any one assist me with a theme or module plugin for the various types of phones and mobile devices available instead of manually inputing pictures and specifications for each?( description , pictures, details and specifications of phones already existing)… i am new to drupal and would sincerely appreciate advice.

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/3/feed