IPhone 5s unlocking explanation?

OK so I live in the West indies and I have family in the US. I want a 5s but they won't spend the full price for an unlocked phone. But they have unlocking services where I live so I suggested that they buy the 16g with at&t and I get it unlocked where I live. They said they have to set up a plan and contract with at&t. Can they just set up any random plan and give me the phone then I unlock it without paying for the service plan per month?

Those discounts require a 2-year contract plan so they would have to pay for the plan for two years or pay several hundred dollars to terminate early.

If they got the phone and didn't activate it on the plan then AT&T would charge them full price for the phone as it would be considered a purchase.

Basically this isn't going to work for saving money.

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