How to install on old iphone 3GS

Archive
1

Looking to use this model as spare but OS 6.1.6 which I believe is too old by some way .

Currently use Norton Mobile Security installed a one of devices licenses I have from the 5 from Norton Security Deluxe

  1. Windows 10 laptop
  2. Android Phone 

Norton Security 22.19.9.63

Norton Mobile Secuity for Android (not needed only iPhone) 4.7.0.4456

2

Sorry. But the current versions of NMS for iOS requires iOS ver 9 and above. The older versions of NMS that did work on pre iOS are no longer available.

Maybe you can search the App Store to find some free AV that still works with the older iOS versions. As a spare device, this should cover your needs.