Will i get charged for calling/using magicjack?

PART:1
i have an iPhone 4 with at&t. My aunt lives in Haiti and she has magicjack with a 305 area code(Miami, Fl). When she calls me i don't get charged but will i get charged for calling her?
PART:2
If i download the magicjack app in the app store can i call her with out getting charged from at&t?

I would appreciate very much it if you guys would answer the questions in two parts please and thank you <:)

If you call on the app make sure you are on Wi-Fi then you won't be charged otherwise you are using data.

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