Imo is video calling app I wish to tell about this because I have used this app when I was started useing IMO I was happy with it video clarity and sound clarity. But when join group chat or group video calling with my friends it was nice but one problem occured slowly that is I was resiving my friends call who was in group chat .and if he call to any other for them my number was coming . due to this I had fight with my friend also .and then I got dout on IMO so I left the group in IMO as soon as I left the group from IMO my problem was solved. So friends be careful.