Trading an iPhone 5s for a 4s?

Okay so my dad has the four s and I have the five s but he can't afford to get his own and he got it for me. I don't have to but I can switch if I want and I have sixteen gb of data he has thirty six should I switch with him

The iPhone 5S is a much better more modern phone than the older 4S, it seems you would be trading down. Going from 16 gb to 32 gb is not enough reason to trade.

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