Just in case you want to change the mobile number you are registered with, you can follow the steps below:
Step 1: Launch Wynk Music
Step 2: Go to Settings
Step 3: Tap on 'Reset Account'
Step 4: Tap on 'OK' to confirm resetting account
Please note that resetting your account will delete all your music from the device and you will guided to setting up fresh preferences.
Also this functionality is currently available for Android users only.