How does imo pull contacts?

[Marymns]

I got a notification from imo that someone has just joined. I do not have this persons number saved on my phone nor are we friends on any social media. They are now a contact in my imo and i just wanna know how does imo get its contacts? Is it that the other person has my number saved? Thanks in advance

 

[B. Diddy]

Welcome to Android Central! We seem to get questions about imo with some regularity here, but not many people who are familiar enough with it to give good answers. Have you already tried emailing their support team? androidsupport@imo.im