Facetime Audio

We are going to asia (Bhutan) and plan to bring my iphone 5. I would like to use facetime audio to call back home but I understand their wifi is really slow. Does anyone know how fast a wifi one needs to use it with facetime audio?



Are there any other apps etc that might be useful in a very rural area like this too contact home? Any apps that might be useful in Tibet and Bhutan?

Thanks

Jim

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