You can watch A Silent Voice (also known as A Silent Voice: The Movie) through several legal streaming and purchase options:

• Streaming on Netflix, where it is available to watch with a subscription

• Renting or buying digitally on platforms such as Amazon Video, Fandango At Home, Microsoft Store, and Apple TV

• Available on Prime Video in some regions

Crunchyroll also lists A Silent Voice in its anime catalog, which might indicate availability for streaming there

. In summary, the most straightforward options are Netflix for streaming with a subscription or digital purchase/rental on Amazon Video, Apple TV, Microsoft Store, or Fandango At Home