There are many different applications and games on the Nintendo 3DS that can take advantage of an active internet connection over Wi-Fi such as Netflix or the eStore. Unfortunately, since the 3DS is a mobile device, you won't always have access to the internet. If you have a mobile hotspot on a smartphone or tablet, you can share the internet connection over wireless with the gaming handheld.
Have an iPhone? Check out all 200+ new features coming in iOS 13.