I have a Norton Security Premium, ten device license. I just installed it on my Android phone from my PC using the Norton GUI (Add a Device"). It installed what appears to be a free version. I selected the Premium 30 day trial, thinking there would be a field for a license number but I can't find one. Thank you!
Tap on the 3 bars at the top right of the Norton Mobile Security, NMS, app. Then tap on Sign In. When you enter your Norton Account email and password it will activate the full version.