Exchange rate
The key issue here is going to be what your credit card company will bill you for a charge made in Sudan Pounds. I once got a shocking credit card bill for a charge I made in Zimbabwe. If I paid in US dollars on the spot I would have saved many hundreds of dollars. However the Zimbabwe bank charged my card the government exchange rate, which was 4 times the going ( street rate). So beware.
I would like to hear from anyone who makes this journey and starts a Aone4 in Sudan.
Good Luck!
Cheers!