Uhmm Koodo hasn't launched VOLTE yet so not for the call itself. However your phone can still be using data while you are on the call with someone. It drops it 3G if on LTE and continues whatever was using data.
Voice calls use minutes and not data (assuming you are not using Skype or similar VOIP apps). but like Goran said, your phone may still be using data for other tasks (email, facebook, etc) while you are talking on the phone.