Sony has announced that it will have an open trial for PS Plus next week, though it is limited to the online multiplayer. The trial will run from 10am February 22nd until 23:59pm on February 26th. Maybe you’ve never had PS Plus or you’ve let it lapse for whatever reason but either way if there’s any games you’ve wanted to play online on PS4 at least you can do so for free.
Just so there’s no confusion during this trial you will not be able to access the PS Plus games to download or any of the Plus exclusive discounts.
Source: PS Blog