You need to be a member of PlayStation Plus or have a local user account on the subscriber’s ‘Primary PS4’ to play many games online. You can find full details of what PlayStation Plus features you can share with your friends here.
One PlayStation Plus membership allows all local accounts on the subscriber’s ‘Primary PS4’ to play online through their SEN accounts. The PlayStation Plus member does not need to be logged in on the PlayStation 4 for other users to play online.
You can also create a new user on a friend’s PlayStation 4 to enable you to play online on their system, but they will not be able to use your PlayStation Plus access to play online, as the console is not your ‘Primary PS4’. You can both play online on either PlayStation 4 if you are both PlayStation Plus members.
Online play without a subscription
You don’t need to be a PlayStation Plus member to play online on your PlayStation 3 or PS Vita, but we recommend subscribing as it allows you to take advantage of all the extra features you receive when you join.
You also do not need to be a member of PlayStation Plus to play non-synchronous games on the PlayStation 4. Synchronous games are games where two consoles need to be synched up to communicate with each other in real time - for example if you are playing co-op or competition mode on a shooting or racing game. Non-synchronous games mean that the two consoles do not need to be communicating in real time – for example when playing turn based games like chess.