Before you proceed, you need InTouchApp installed on your phone.
How to delete contacts from InTouchApp?
Step 1 - Go to contacts.intouchapp.com and login
Step 2 - You can select contacts from clicking as shown below. You can continue scrolling the contacts and can select all the contacts.
Step 3 - Once you have selected them, you can Delete them at once by clicking the Delete button.
For further questions, you can drop us an email at support@intouchapp.com or Chat with us.