50% of total budget will be released after successful demo on our apk. Nothing will be given in advance. No need to waste my time in bargaining. I already have a working chat app. I just need the Video/Voice calling module integration in my Android Chat App. Video/Voice calling module should be free or cheapest and best with buggering free experience. It shud work on Edge, 2G, 3G and 4G very smoothly.
Only experienced developers may apply.