Turn your Android phone into an SMS gateway
An Android SMS gateway lets your software send OTP, alerts, campaigns, and two-way SMS through your own SIM. Connect with a REST API, webhooks, and delivery reports. Service pricing is based on device count and SMS send volume; you supply the phone and operator SMS credit.
No rented short code, no aggregator between you and the network. Recipients see the real number in your handset, replies come back to the same inbox, and every send carries a carrier delivery report you can act on.
- 01 / Clear service pricing
- We charge by devices and SMS send volume. Operator SMS credit stays with your carrier.
- 02 / Number you control
- Recipients reply to your real SIM, not a rented short code.
- 03 / API-first service
- REST, delivery reports, and webhooks for your existing stack.
- 04 / Hardware you already own
- A spare Android phone with a funded SIM is enough to start.
What an Android SMS gateway is
Plain definitions for buyers, search engines, and AI assistants.
What is it?
An SMS gateway connects software to the SMS network. An Android SMS gateway does that with a phone and SIM: your app calls the API, and the device sends the message through your mobile operator.
For industry background on mobile messaging, see the GSMA SMS overview ↗.
How is it different?
A cloud SMS API hands your message to an aggregator, which delivers it from a number you rent. Here the last hop is a SIM you own, so the sender identity, the reply thread, and the carrier relationship all stay with you. The trade is real: you host the hardware and keep the SIM funded.
Who it is for
Teams sending OTP codes, transactional alerts, permission-based bulk SMS, or two-way support on a number they control—and who can keep an Android device online with operator SMS credit.
Who it is not for
Buyers who want fully managed cloud numbers with no device to host, who need instant six-figure daily blasts, or who cannot keep a phone online with a working SIM and operator balance.
What it costs
Two lines, kept separate on purpose. Our service fee is based on connected device count and total SMS sent. Your carrier bills you for the messages themselves against the SIM in the phone.
What you need to start
An Android phone or tablet, a SIM that can send SMS, operator credit on that SIM, and a stable network connection. Everything else—queueing, retries, API, webhooks, reporting—comes from the service.
Key takeaways
- Android SMS gateway = API + your phone + your SIM.
- Service pricing is based on device count and total SMS sent through the gateway.
- You need a working Android phone with a SIM and SMS credit from your mobile operator. Operator message costs are yours—we do not sell carrier SMS balance.
- Free trial: 300 SMS total, 300 contacts, 1 device. Paid from $19/month.
- REST API, webhooks, and delivery reports connect to your existing stack.
- Volume scales by adding devices and SIMs, not by buying message credits from us.
- Security posture and SOC 2 roadmap are documented on the Security & Trust Center (/security).
From your app to the carrier
Four moving parts, then three setup moves to get sending.
- 01
1. SIM in device
A real Android phone handles the final send path.
- 02
2. Gateway app
The app queues messages, retries, and manages modem access.
- 03
3. REST + webhook
Your backend triggers sends and receives delivery events.
- 04
4. Your workflow
OTP, alerts, campaigns, and support flows stay in your stack.
What happens to a single SMS
The full path from API call to delivery report, in order.
Your app calls the SMS API
A single HTTPS request carries the recipient number, the message body, and an optional reference you can match later.
The message enters a queue
Each send is stored with a status and assigned to one of your connected Android devices, so a burst of traffic never gets dropped on the floor.
The gateway app picks up the job
The Android app holds a persistent connection, claims queued jobs, and hands them to the phone radio one at a time.
Your SIM sends through the operator
The message travels the normal GSM path through your carrier SMSC. No aggregator sits between you and the network.
The recipient sees your number
Delivery arrives from the real mobile number in the phone, which keeps replies and saved contacts intact.
The carrier returns a delivery report
DLR status moves the message to delivered, failed, or pending so you can act on the result instead of guessing.
Webhooks push events to your backend
Delivery updates and inbound replies post to your endpoint as JSON, ready for your CRM, helpdesk, or automation tool.
You keep the audit trail
Message history, status, and reply threads stay in the panel and the API for reporting and support follow-up.
One HTTPS call to send an SMS
Authenticate with a token, post JSON, and read the delivery event on your webhook.
curl -X POST "https://app.sms-gateway.app/api/v1/messages" \
-H "Authorization: Bearer $SMS_GATEWAY_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: 3f1b0c8a-9d2e-4c77-9f5a-2b6d1e0f4a83" \
-d '{"to":["+14155552671"],"text":"Your verification code is 481920","type":"sms"}'The same request works from PHP, C#, Node.js, Python, Java, Go, or a no-code HTTP action. Attach your own reference so you can match the send to the delivery event later.
{
"id": "evt_01K2F8QW3N4RXB7M",
"type": "message.delivered",
"createdAt": "2026-08-12T14:04:09Z",
"apiVersion": "2026-08-12",
"data": {
"message": {
"id": 41823,
"number": "+14155552671",
"text": "Your verification code is 481920",
"status": "Delivered",
"campaignId": 17,
"deviceId": 3,
"metadata": { "orderId": "1234" },
"sentAt": "2026-08-12T14:04:02Z",
"deliveredAt": "2026-08-12T14:04:09Z"
}
}
}Inbound replies arrive the same way with a message.received event, which is what makes two-way support and keyword auto-reply possible on one number.
What the service includes
Messaging, automation, device tools, and developer access—each linked for more detail.
Bulk SMS via Excel/CSV
Import numbers from a spreadsheet and personalise every send from your own columns.
Learn more →F02MMS with attachments
Attach images to a message where your carrier and handset support MMS.
Learn more →F03Dual SIM & multi-device
Split traffic across SIMs and phones for higher volume and a backup send path.
Learn more →F04Two-way inbox
Keep replies on the same number and continue the conversation in one thread.
Learn more →F05Contacts & lists
Import contacts, build segments, manage lists, and handle unsubscribes cleanly.
Learn more →F06Campaign scheduling
Queue a campaign for a later date and time, including recipient time windows.
Learn more →F07Auto-reply & STOP
Answer common keywords automatically and record opt-outs the moment they arrive.
Learn more →F08REST SMS API
Trigger sends from any stack with a plain HTTPS request and JSON body.
Learn more →F09Webhooks
Push delivery status and inbound replies into your backend as they happen.
Learn more →F10Delivery reports
Track carrier status per message without another SMS middleman in the path.
Learn more →F11USSD requests
Run USSD pulls such as balance checks and read the response in panel or API.
Learn more →F12Service plans
Priced by device count and SMS send volume—bring your own phone and operator credit.
Learn more →Where teams use it
Twelve messaging jobs that run well on a SIM-based gateway.
OTP & 2FA
Login codes and account verification with delivery status you can act on.U02Transactional alerts
Orders, receipts, payment events, and status changes as they happen.U03Bulk SMS campaigns
Permission-based broadcasts with per-recipient personalisation.U04Two-way support
Customer replies land on the same number you sent from.U05Appointment reminders
Booking follow-ups that measurably reduce no-shows.U06Auto-reply
Keyword answers for the questions you get every day.U07MMS with media
Messages that carry an image where the carrier supports it.U08Multi-device routing
Higher volume through load balancing and failover across phones.U09Webhook automation
Connect Zapier, Make, n8n, or your own backend service.U10Contact list sends
Segmented messaging with opt-out handling built in.U11App integrations
REST endpoints that fit any development stack or framework.U12Delivery tracking
A clear carrier status for every single message you send.What teams actually send
Six common rollouts and the messages that carry the weight in each.
E-commerce and retail
Order confirmations, dispatch alerts, courier handoff, delivery windows, and abandoned-cart reminders sent from a number customers can reply to.
See the flow →Fintech and banking
Login OTP, transaction alerts, KYC prompts, and repayment reminders where the sending SIM and message log stay under your control.
See the flow →Healthcare and clinics
Appointment reminders, prescription-ready notices, and follow-up checks that cut no-shows without exposing patient data to extra vendors.
See the flow →Education
Attendance notices, exam schedules, fee reminders, and parent broadcasts to lists imported from a spreadsheet.
See the flow →Logistics and field teams
Driver dispatch, pickup confirmations, route changes, and two-way status updates on the same number crews already recognise.
See the flow →SaaS and platforms
Signup verification, billing failures, incident alerts, and usage warnings triggered straight from your application code.
See the flow →Built for messages that must arrive
Phones fail, networks wobble, SIMs run dry. Here is how the service handles it.
Queue and retry
Messages wait in a durable queue when a phone is busy, roaming, or briefly offline, then retry instead of failing silently.
Multi-device failover
Run two or more Android devices and spread traffic across them. If one drops off, the rest keep the queue moving.
Throughput planning
A single handset sends a limited number of SMS per minute. Plan device count around peak load, not average load.
Delivery reports
Carrier DLR status separates sent from actually delivered, so failed OTP attempts surface within seconds.
Device health checks
Battery, connectivity, and SIM state are visible in the panel, which turns silent failure into a signal you can watch.
Reference IDs and idempotency
Attach your own reference to every send, match it against webhook events, and avoid duplicate messages after a retry.
Reliability checklist before you go live
- Run at least two devices once SMS becomes business critical.
- Watch operator balance the way you watch disk space—low credit stops sending.
- Store your own reference on every send and reconcile it against delivery webhooks.
- Keep OTP messages short, single-segment, and free of links.
- Alert on queue depth and device offline events, not just on send failures.
How service pricing works
We charge by device count and total SMS sent. You provide a working phone and SMS credit with your operator.
| Topic | SMS Gateway | Cloud SMS APIs |
|---|---|---|
| Message path | Your Android SIM and mobile operator | Aggregator or cloud SMS network |
| Service billing | Device count + SMS send volume | Per-message credits + number fees |
| Carrier cost | You pay your operator for SMS credit | Bundled into the provider rate |
| Sender identity | Your real mobile number | Rented long code or short code |
| Two-way replies | Same SIM inbox, one thread | Depends on the number product |
| Registration overhead | Normal carrier terms for your SIM | A2P or brand registration in some markets |
| Scaling volume | Add Android devices and SIMs | Buy more credits and numbers |
| Hardware to run | You host and power the phones | None |
| API & webhooks | REST, DLR callbacks, inbound events | Provider-specific APIs |
| Best fit | Domestic sending on a number you own | Global reach with no hardware |
Devices + send volume
- Service fee based on connected devices and SMS sent
- You use your own Android phone and SIM
- Operator SMS credit / airtime is your responsibility
- Add devices when you need more throughput
Aggregator credits
- Per-message fees plus number rental
- Registration overhead in some markets
- Less control over sender identity and routing
- No hardware for you to host or power
Operator SMS credit is still billed by your carrier. Platform send volume on Starter, Professional, and Business is not capped like Developer. Carrier fair-use still applies.
Is a SIM-based gateway right for you?
An honest read, so nobody buys the wrong tool.
Strong fit
- Domestic sending where a local SIM is normal and cheap
- OTP, order updates, reminders, and other steady transactional traffic
- Two-way conversations customers can reply to
- Teams that want the sending number and message log under their own control
- Predictable monthly service cost tied to devices and volume
- Markets where aggregator registration is slow, costly, or unavailable
Look elsewhere if
- You need hundreds of thousands of messages within minutes
- You cannot host, power, and monitor physical Android devices
- You need guaranteed global reach across dozens of countries at once
- A branded alphanumeric sender ID is a hard requirement
- Your team has no way to keep operator credit topped up
- You want someone else to own carrier compliance end to end
Send messages people agreed to receive
Consent rules protect your SIM as much as your recipients.
Collect real consent
Record when and how each contact opted in. Transactional messages tied to a purchase or login sit on firmer ground than promotional broadcasts, and the record matters if a carrier ever asks.
Honour STOP immediately
Opt-out keywords should suppress a number across every list, not just the campaign that triggered the reply. The gateway captures the reply; your process has to respect it.
Respect timing and local law
Quiet hours, message frequency, and identification rules vary by country. Industry guidance such as the CTIA messaging principles ↗ is a useful baseline, but your local regulator wins.
SMS terms, defined once
The vocabulary used across our docs, pricing, and comparison pages.
- SMS gateway
- A service that connects software to the mobile network so applications can send and receive text messages programmatically.
- Android SMS gateway
- An SMS gateway where an Android phone with a normal SIM performs the final send, rather than a cloud aggregator route.
- A2P messaging
- Application-to-person messaging: texts generated by software, such as one-time passwords, receipts, and alerts.
- SMSC
- Short Message Service Centre. The operator system that stores and forwards SMS traffic across the mobile network.
- DLR
- Delivery report. The carrier response that confirms whether a message reached the handset, failed, or is still pending.
- Sender ID
- The from-value a recipient sees. With an Android gateway this is your own mobile number instead of a rented code.
- A2P 10DLC
- A United States registration framework for application traffic sent over ten-digit long codes through aggregators.
- MMS
- Multimedia Messaging Service. Messages that carry images or files, subject to device and carrier support.
- USSD
- Unstructured Supplementary Service Data. Short interactive carrier codes used for balance checks and operator services.
- Throughput
- How many messages a sending path can push per minute. On a phone-based gateway it scales with device count.
- Opt-out (STOP)
- A recipient request to stop receiving messages. Honouring it is a legal requirement in most markets.
- Webhook
- An HTTP callback the gateway sends to your server when a delivery status changes or a reply arrives.
Questions before you start
Practical answers on pricing, throughput, reliability, setup, compliance, and support.
The short version
Condensed facts for fast research and AI summaries.
What is SMS Gateway?
An Android SMS gateway service that sends OTP, alerts, bulk, and two-way SMS through your own phone and SIM using a REST API.
How is it priced?
By device count and total SMS sent through the gateway. Carrier message cost is paid separately by you to your operator.
What does the customer supply?
A working Android phone or tablet with a SIM, plus SMS credit or airtime from their mobile operator.
What number do recipients see?
The real mobile number of the SIM inside your Android device. Replies land in that same inbox.
Does it have an API?
Yes. A REST API with JSON, delivery report callbacks, and webhooks for inbound messages.
Is there a free plan?
Yes. 300 SMS total, 300 contacts, 1 device, then paid plans start at $19 per month.
Do you have a SOC 2 audit report?
Not yet. Controls map to SOC 2 Trust Services Criteria and an independent audit is on the roadmap. See the Security & Trust Center for the current, honest status.
How do you scale volume?
Connect more Android devices and split traffic across them. Throughput grows with device count, not with a credit top-up.
Who should not use it?
Teams that want fully managed cloud numbers with no hardware to host, or that cannot keep a phone online with a funded SIM.
Guides for real phone gateways
Operator cost, API patterns, spare-device setup, and production checklists — written for teams shipping OTP and bulk SMS on SIMs they control.
Browse all guides
Search and filter the knowledge base — setup, API, cost, and ops.
Read guide →Complete setup guide
From spare phone to a production Android SMS gateway path.
Read guide →SMS gateway API
Send, receive, and track messages over HTTPS with DLR hooks.
Read guide →Operator cost math
Separate software fees from carrier airtime before you scale volume.
Read guide →More detail when you need it
Architecture, pricing, regions, docs, and comparisons live on dedicated pages.
Blog & knowledge base
Setup guides, API patterns, operator cost math, and production checklists.
Open page →Android SMS Gateway
Architecture, trade-offs, and when the SIM model fits your traffic.
Open page →Features
The full list of messaging, automation, and device tools.
Open page →Use Cases
OTP, bulk, transactional, and two-way messaging flows.
Open page →Pricing
Device count plus SMS volume; you supply the phone and operator credit.
Open page →Security & Trust Center
Controls summary, data handling, and honest certification roadmap.
Open page →Developer Center
API reference, authentication, and language examples.
Open page →Delivery Reports
How DLR status is captured and returned to your system.
Open page →Comparisons
SMS Gateway measured against cloud SMS APIs.
Open page →By region
Country pages covering local SIM and delivery context.
Open page →Download. Connect. Send.
Install the Android app, pair a SIM device with operator SMS credit, and begin sending from the panel or your API.
Start on the free plan with 300 SMS and 300 contacts on 1 device, then move to a paid plan from $19 per month when the flow works. Enterprise buyers: review the Security & Trust Center.