# Show HN: Let agents send/receive SMS using your old Android phone

> Source: <https://simlink.snaz.cz/>
> Published: 2026-06-19 21:06:38+00:00

[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.

``` bash
# 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

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](/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

### 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](/registration/new)

### 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](https://github.com/LukBrezina/simlink)

tested clients

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