It would depend on how the site is made. Are you using a CMS like Wordpress or Drupal? What about WooCommerce? Where would you see each phone? For instance, maybe you list popular phones on front page, through search, by category, etc. And then each phone would have its own page? If you have them listed on front page, in search results, by category, etc AND they also have their own page, it is super important to use the rel canonical tag. You want one page to be the official or canon page for each phone.
So if each canonical page should have a unique title and url. Any pages that link that item should link to the canonical page. If you are using CMS, this can be automated (and you definitely want to set up so this gets automated). You just have to be sure the settings are set right.
You also probably want hackable URLs. So for instance you may have phonesite.com/apple/att-iphone-16gb where each Apple phone is phonesite.com/apple and if you go to phonesite.com/apple it shows all the iPhones. Or you could do that by carrier. Probably not both.
Hope this helps!
