Nader, I just try them! Of course, I only try free apps. Some work, some don't.

If you want to be scientific, or if there's something you really need/want, try searching this forum. People have made copious lists of apps that work well on the eDGe. You can follow in their footsteps. Many times you will find a link to a download site that works for that app, but if you don't, try googling the name of the app plus "apk" and see if you find a way to download what you want.

Good luck! Have fun!!


(I see I might not have answered your real question, which is how can you tell which Android Market apps will work, but I'll leave my answer just in case it helps!)