How to solve invalid mobile number in receiver's contact? EasyParcel Marketing Modified on: Wed, 16 Oct, 2024 at 5:38 PM We'll Cover:Guide to solve invalid mobile number in receiver's contact?Guide to solve invalid mobile number in receiver's contactStep 1: Go to shopify admin panel, click "Settings" on the sidebar.Step 2: Click "Checkout" on the sidebarStep 3: Under "Customer Information" tab, select "Required" value under "Shipping address phone number" section Contact Us for Assistance