I use the app all the time when I am looking for a business that I want to contact. I always find what I am looking for and they have mapping and directional services as well which makes it easy to find any place in Egypt.
You can search by business name or even just a product or service. For example I was with my kids in Nasr City and we got hungry and wanted to eat pizza so I searched for pizza and because it is location based in gave me all pizzerias in Nasr City sorted by distance. Fantastic.
No need to pay high fees for 140 or Mobinil 8000 or Vodafone 2121 when you can get all the data you need faster and for free. I believe they have over 350,000 businesses in there database so it is almost guaranteed that you will find what you are looking for.
Egypt Traveler about Egypt Yellow Pages, v3.2.0