Iphone with plan without SSN

When you get a phone with a plan, you are entering into a contract with the carrier. No commercial company will enter into a personal service contract with someone without certain assurances that you'll meet the terms of the contract, or at least that they have reasonable recourse to go after you if you break the contract That means a credit check with SSN for ID confirmation. They also won't give you a plan if you had a credit check run but had no bank or credit accounts from US sources in the credit record, if your score was too low, or other flags in your record come up (often, young people whose credit record is very short have to put down sizeable security deposits, for example, simply because they have not established a lengthy enough credit history to be considered for optimal service offers).

It's business and your interpretaion of what's fair has nothing at all to do with it. You need to meet minimal requirements for the carrier to enter into contract with you - if you don't they can refuse to do business with you which means no contract and hence no subsidized phone. Those requirements are the same for everybody.

No. Only with cash, or buy a cheaper phone.