OpenPhone is a voice over Internet protocol (VoIP) service that allows you to make unlimited calls and texts for a low price — without using any minutes from your phone plan. It is trusted by top brands like YCombinator, Stanford University, and Deel. In terms of functionality, it offers native apps for mobile and desktop, team collaboration features, and integrations with popular tools. A great option for SMBs and startups looking for a modern and affordable phone system.