To hide your mobile number from your user profile, you simply do the following:
1. Go to "Account".
2. Click on "Manage Account".
3. Click on "Edit Profile".
4. Below your phone number, you click the button that indicates that you wish to hide your number from profile.
Unfortunately, you are not able to hide your mobile number from listings, as phone calls are the main way for other users on the platform to contact you.