You can enjoy a 7-day free trial of the Nintendo Switch Online paid membership service!  In Nintendo eShop, select the Nintendo Switch Online option on the left navigation to activate your free trial. 

Please note: one free trial period available per Nintendo Account.  During the free trial, you can use the online play, voice chat via the smartphone app, Save Data Cloud and Nintendo Entertainment System - Nintendo Switch Online services.  It’s not possible to purchase Nintendo Entertainment System Controllers during the trial period. 

If automatic renewal is set, once your free 7-day trial is over, your membership will be renewed via the automatic purchase of an individual 1-month (30 day) membership.  If you do not wish to purchase a membership, you can terminate automatic renewal during the free trial and will not be charged.