simhook turns an Android phone into an SMS API.

Pair a phone with a SIM in it. Every message you send from code goes out through that SIM, and every text the phone receives comes back to you as a webhook. Your numbers, your carrier plan, no per-message fees.

It is a Go API you can self-host, an Android app that stays out of the way, a dashboard, a TypeScript SDK, and an MCP server so an agent can text people too.

Start free Download the appAndroid 8.0+, 2.3 MB, updates itself

send one

# any HTTP client, or the SDK, or an agent over MCP
curl https://api.simhook.dev/v1/messages \
  -H "X-Api-Key: sh_..." \
  -H "Content-Type: application/json" \
  -d '{"to": ["+15550001111"], "body": "Your code is 482913"}'

# about two seconds later, at your server
POST /sms-events
X-Simhook-Event: message.delivered
X-Simhook-Signature: t=1788618234,v1=9f3c1a...
{"id": "...", "event": "message.delivered", "data": {"recipient": "+15550001111", "status": "delivered", "delivered_at": "2026-09-05T13:53:30Z", ...}}

Every state change is a signed webhook: sent, delivered, failed. Incoming texts arrive the same way, with the sender and the SIM that received them. Quickstart

what you get

Send and receiveThrough your own SIM. Dual SIM works; pick one per message.
Delivery receiptsSent and delivered from the carrier, not guessed.
WebhooksHMAC-signed, retried for two days, paused when your endpoint keeps failing.
Sends and schedulingUp to 5,000 recipients in one call, a send time if you want one.
SDK and MCP serverTyped client for Node and edge runtimes. Eight tools for agents.
Self-hostingOne VPS, one compose file. AGPL-3.0.

what it looks like

1,284sent today

98.6%delivered

312received

3queued

Pixel 8Turkcell, SIM 1, checked in 40 s ago

Galaxy A54offline 3 h

+1 555 000 1111delivered, 12:04:21

+90 532 000 0000received, 12:03:58

+44 7700 900123sent, 12:03:40

app.simhook.dev

The simhook Android app: phone online, gateway enabled, forwarding on, one SIM listed

the app on a Pixel 8

pricing

Plan	Includes	Price
Free	30 messages a day, 500 a month, one phone, the whole API	$0
Pro	10,000 messages a month, three phones, 500 recipients per send	$12 / month
Scale	50,000 messages a month, ten phones, 2,500 recipients per send	$39 / month

Messages are counted, not billed: the carrier plan on your SIM is what actually sends them. Self-hosting is free and has no limits. Details

questions

Will my carrier mind?: Consumer plans are for people, not bulk. The app paces sends with a delay you set, and the dashboard shows what went out. Keep it to what your plan allows and to people who want your messages; for real volume use a business SIM.
Does it forward one-time codes?: Yes. The app targets Android 16 on purpose, because Android 17 withholds code-like texts from newer apps for three hours unless they are the default SMS app.
Can I run it myself?: Yes. The whole stack runs from one compose file on a small VPS, and the app can be pointed at your server when you pair it. Self-hosting
Where does the app come from?: From this site, signed and published on GitHub. Google Play does not allow apps that send SMS on your behalf unless they are your default messaging app, so simhook is installed directly and updates itself.