No, you do not need a computer for phone-based VoIP services. However, you do need an existing broadband Internet connection. You can also purchase a dedicated IP phone; but this is not necessary, as most providers offer a BYOD (Bring Your Own Device) option.

An ATA (sometimes provided free of charge through your VoIP provider) can be connected to your existing phone to a high-speed internet connection.

With a computer, one can manage and use different features offered by the provider, but owning a computer is not required for VoIP service.