Why doesn't Credo mobile offer the iPhone?

I'm not asking for the technical explanation of why you can't activate an iphone on credo mobile's network or anything along those lines. I'm simply very curious as to the political reason behind Credo mobile's refusal to offer the iphone. Is there tension between Credo and Apple or something?

I'm almost positive Credo Mobile has always had strong allegiance and loyalty to Samsung and Droid phones. They offer smartphones specifically from Samsung in order to keep that relationship progressing.

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