If you are looking for a "free" or "leaked" key, be cautious. These are often invalid or used to spread malware. You can start a 7-day free trial directly from Norton if you don't have a key yet.
Understanding Your Product Key for Norton 360 Mobile: Setup and Activation Link Guide product key for norton 360 mobile link
If you prefer to enter the key directly on the mobile app: If you are looking for a "free" or "leaked" key, be cautious
Double-check for typos. The key is 25 characters, and hyphens are usually entered automatically. and hyphens are usually entered automatically.
