It is important that you provide the correct phone number because fellow carpoolers may be trying to contact you. Voice to voice can be tons easier to make and change arrangements like pickup or drop-off point. It is also not dependent on internet connection so this is an important feature of the app.
Running late, not a problem when you can easily let your carpoolers know with a quick call!
Also you will get notifications if you have unread messages from carpoolers you have scheduled a ride with so you don’t miss out on them.
Wunder does not share your details with any 3rd-parties. Your phone number is also not displayed on your profile and can only be used by another user when you have confirmed to ride with them.