SimLink by Snáz.cz

sms · mcp · your sim

SMS for your agents,
over MCP.

A small, self-hostable server that gives an AI agent a real phone number. It relays texts through an old Android phone and a prepaid SIM you control — send and receive over the Model Context Protocol. I built it for my own agents and put it here in case it's useful to you. It's open source.

get the Android app create an account read the source
mcp · streamable http ready 
# point any MCP client at the endpoint
$ https://simlink.snaz.cz/mcp   Authorization: Bearer <token>

# or, for clients that only accept a URL
$ https://simlink.snaz.cz/mcp/<token>

# get a token → install the app, sign in, share a SIM

how it works

your agentany MCP client
→mcp / http
SimLinkrelay server
→device api
your phoneAndroid app + SIM
→sms
anyonea real number

Nothing in the middle stores your texts. The server holds a message only long enough to hand it from the agent to the phone (or back) — encrypted, never logged, pruned within minutes.

mcp tools

send_sms(to, body)

Send a text from the SIM the user shared with you.

list_messages(since?, limit?)

Recently sent messages, with delivery status and any error.

fetch_sms(box?, since?, address?, limit?, request_id?)

Read SMS already on the phone (inbox/sent). Two-step and non-blocking: start a read, then call again with the returned request_id to collect the rows.

Args marked ? are optional. Full machine-readable summary at /llms.txt.

properties

transit
TLS between phone, server, and agent.
at rest
Encrypted in the database; pruned within minutes.
logs
Message bodies are never written to logs.
history
None — a transient relay, no browsable archive.
number
A real SIM number, not a shortcode that gets flagged.
hardware
Any spare Android in a drawer + a prepaid SIM. Nothing to buy.
cost
Your normal per-text rate. No subscription, no per-seat fee.
source
Open source — audit it, or run the whole thing yourself.

run the server

hosted · easiest

Use this instance

Create an account here and connect a phone in minutes — I run the server. Messages are encrypted in transit, never logged, and pruned within minutes.

create an account
self-host · full control

Run it on your VPS

It's open source. Deploy the whole SimLink server yourself with Kamal — your domain, your database — then point the Android app at it.

read the source

tested clients

Claude Desktop Claude Code ChatGPT Cursor Hermes OpenClaw

Any MCP client works — these just have copy-paste guides. Building an agent? Point it at https://simlink.snaz.cz/mcp