@Nath81, when in Egypt, for data, I would suggest using Wifi where possible, this should cost you nothing, but for phone calls you will see in the link @Northerner has given you, you can pay a fee to make calls whilst there, but there is also a limit as to how many minutes you can use for free. Lovely country, enjoy, people are very friendly, but will try and sell things, street sellers everywhere, remember to haggle!
On top of what @Northerner has written, make sure that call abroad and premium calls are enabled.
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