Alan Mamedi, co-founder of Truecaller
Media playback is unsupported on your device
Video

'Everything will be in the cloud'

We meet the people behind Truecaller, the app which started life by blocking spam phone calls and is now growing to identify those who contact your mobile phone.

Questions have been raised about the privacy surrounding the way the business collects data, but Truecaller says it is simple for anyone to remove themselves from its database.

Go to next video: That's edutainment