Using my US iPhone 3Gs in Egypt

[kahmed]

I have a iPhone 3gs I purchases in the United States and active on AT&T. I will be going to Egypt next month for a week. I have researched and apparently the GPS will not work in Egypt. But what do I need to do so I can use my phone/data in Egypt? I understand Vodafone supports the iPhone but do I need to unlock it still?

If i purchase a Vodafone simcard in Egypt will I be able to use my data there?

Does anyone know general costs for a Vodafone simcard/data plan?

Thanks for the help