Set up in minutes.
Start sending with one API call.
One app install. One pairing code. One API key. You're sending.
Connect a sending device
Install Relayion for Android. It runs continuously in the background and stays connected to Relayion.
Link it to your account
Generate a pairing code in the Relayion Console. Enter it in the Relayion app on the device. No USB cable or carrier paperwork needed.
Integrate your application
One API key per integration. Scope it to a device or SIM slot. Rotate without downtime.
Send and receive messages
POST /api/v1/outbound with recipientNumber and body. The API dispatches to the phone. The SIM sends the SMS.
What teams build with it.
One API for the messages your business actually depends on.
Clinic appointment reminders
Send reminders from the clinic's own number. Patients already have it saved. Replies route back to your system.
AI agents that text humans
Give your AI agent a real phone number. Outbound messages and inbound replies flow through the same API.
Order & shipping updates
Confirmations and dispatch notifications from a number your customers recognise. Flat monthly cost.
2FA codes & OTPs
Time-sensitive codes over a real SIM. One device, one number, multi-SIM fallback if needed.
Staff alerts & approvals
Incident alerts and reply-based approvals over SMS. No app install needed on the receiving end.
Loyalty & promotions
Outbound promos from a local number. STOP and HELP replies route to your webhook for opt-out handling. Flat monthly rate.