The YeeCall ID is actually the phone number you used to access the application. According to the developer's description, YeeCall doesn't require a username or a PIN to access the app. Only the phone number is used for this procedure.
To read more about it, use the following Google Store link: https://play.google.com/store/apps/details?id=com.yeecall.app&hl=en
You'll have to use another SIM card in order to change the "ID".