Best MCP servers for messaging and SMS

Plenty of agent work ends in a message to a human: a verification code, an order update, an alert that something needs a person. Wiring that into an agent used to mean a bespoke API client per channel; with MCP the agent just calls a tool that sends an SMS, places a voice call, fires a WhatsApp template, or posts into a chat thread. The right server depends on which channels you live on and whether you need carrier-grade telephony or a community chat bot. Some teams need programmable SMS and voice with verification and number lookup; others need WhatsApp, RCS, and voice fallbacks; others just need to reach people where they already are, on Telegram or Discord. The servers below cover those shapes, each a real MCP server with a verified, current install config.