@PaulRead_357851 Please see article at top of the list of posts regarding setting your phone to work abroad.
Then look at Price Guide to see cost of International Roaming and decide how much top up you will need to add to your account.
You can also consider an e-sim that works in Egypt if your phone will accept it or you could purchase a local SIM card when there.
Finally, consider any free wifi and using something like WhatsApp to make calls to others who have the app.
