You can watch "Smiling Friends" on several platforms. The show is available for streaming on HBO Max, where you can watch all seasons. It is also accessible through the Adult Swim website and app, which streams episodes for free, including the latest season. Additionally, "Smiling Friends" airs on Adult Swim TV, typically on Sundays at 11:30 p.m., with new episodes available the next day on HBO Max. Other options for live streaming include YouTube TV, Sling TV, and DIRECTV, all of which often offer free trials. In the UK, the show can be watched on Channel 4. If you prefer to buy or rent, it is available for purchase on Amazon Video, Apple TV, and other digital platforms. DVDs are also an option for offline viewing. For an optimal streaming experience in the US, HBO Max is recommended, with subscription plans starting at $9.99/month, and bundles available with Disney+ and Hulu. The Adult Swim app offers free streaming of episodes, and new episodes are uploaded there concurrently with their TV airing. In summary, major legal viewing options for "Smiling Friends" include HBO Max, the Adult Swim app/website, subscription live TV services with Adult Swim channels, and digital purchase platforms, with some free viewing available on Adult Swim itself.