Can i change other one with bigger memory?

Dear Mr/Mrs,
I bought my iphone 5s 16G and just actived 1 day ago. It't great and make me very happy. But i need other one with bigger memory 32G or maybe 64G. Can i change? How much i must pay more and where or how can i change it?
Thanks for your help.
Mimosa Flower

Thanks for your reply.
My friend bought maybe on 18 May in US. But i just get it in Viet Nam 1 day ago. Can i pay more to get bigger memory?

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