RSIM 10 straight talk

Hi. I received an iPhone 6 sealed purchased at Walmart in USA, but here in Chile I can not activate it. He came with a sim within the company straight talk but have no signal here to activate the smartphone. I can with a RSIM 10 activate my iPhone? here in my country the networks iPhone takes me, but I can not activate it. In case you can not activate my iPhone with a RSIM, is there any solution?