Apple sells 14 iPhone models. Not taking into account colors, capacity or Carrier.

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OK, I thought they sold all models listed on web site.

So no 6 or 6 Plus. But all others are for sale, if not from Apple directly, then form carriers

ATT has 14 models listed right now, some for sale, some with 'coming soon"

https://www.att.com/buy/phones/browse/Apple