How to IMessage people out of the country?

My sister lives outside the country and she got a new IPhone with the countries number and area code I put her number in my phone and try to text her and it doesn't turn blue help please.

Your cellular provider may charge an extra fee for international texting. Be sure to include "+" and the country code. Press and hold 0 until you see a +.

Send a letter… For christs sake… Millenials

IMessage is done via Apple's servers which can even be done using your Wi-Fi. As long as you both have iMessage enabled then you can iMessage each other other Wi-Fi or cellular, even across the world

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