IMO MESSENGER APK FOR ANDROID GUIDE 

Imo video calling:
You can vote high for IMO video calling software for the laptop. I have personally used this software for calling my friends and believe me it works fine even in 2g networks without a lag in video quality (of course, sometimes it lags but most of the time it gives best results).
You can find more on: http://www.imoforpcappdownload.com/