Channels · SMS

Enterprise SMS on Colombia's most reliable network

The universal channel: it reaches every phone, with no data plan or app required. More than 23 years operating SMS for the most demanding companies in Colombia, with direct, redundant connections to every mobile operator.

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10:24

89xxxShort code

Today · 10:24

Inalambria Bank: Your verification code is 482913. It expires in 5 min. Never share it with anyone.

Text message

Sample message

SMS is still the channel with the widest reach and the highest read rate. At Inalambria we run it as critical infrastructure: separate routes for OTP traffic, automatic reconnection with operators, load balancing and overflow to alternative channels when needed.

Send from our web platform, through the REST API or over dedicated connections, using shared or dedicated short codes, with real-time delivery reports.

6B+: mobile messages and Emails processed per year
42M: unique Colombians reached every month
3.000: transactions per second at peaks
23+ years: operating the SMS channel in Colombia

Capabilities

Direct connection to every operator

Redundant links with every mobile operator in the country and automatic reconnection to keep the service running.

Dedicated and shared short codes

5 or 6 digit numbers that belong only to your brand: the messaging equivalent of your .com domain, easy to recognize and hard to spoof.

Independent route for OTP

We isolate critical processes such as OTP notifications so they are managed independently and securely, never competing with bulk campaigns.

Two-way SMS

Receive replies, confirmations and keywords from your customers for surveys, appointment confirmations or transaction approvals.

Real-time delivery reports

Per-message status through the platform, the API or callbacks (webhooks) to your own infrastructure.

Overflow to alternative channels

Automatic load balancing and overflow to RCS, WhatsApp or Email when the context calls for it.

Related use cases

Alerts and notifications

Transactions, reminders, order updates, due dates and service notices delivered in seconds, over priority routes with real-time reporting.

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Verification

One-time codes for sign-up, login and transaction approval, isolated from bulk traffic and backed by automatic cross-channel failover.

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Marketing and promotions

Promotions, launches and loyalty campaigns over SMS, RCS, WhatsApp and Email, with segmentation, personalization and automatic RNE and send-window controls.

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Fraud detection

AI against smishing, dedicated short codes, verified senders and real-time transaction confirmation.

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Hybrid communication

Orchestrate SMS, RCS, WhatsApp, Twnel and Email from a single integration, with automatic overflow, load balancing and rules per message type.

Learn more

Developers

Send SMS through the API

Bearer Token authentication, JSON and status callbacks.

Read the docs API reference

# 1. Request a token (Basic Authentication with your credentials)
TOKEN=$(curl -s -X POST https://rest.inalambria.com/token \
  -u "$INALAMBRIA_USER:$INALAMBRIA_PASSWORD" \
  -H "Content-Type: application/json" \
  -d '{"grant_type": "password"}' | jq -r '.access_token')

# 2. Send an SMS (Colombia: 12 digits, 57 + mobile)
curl -X POST https://rest.inalambria.com/mtmessage \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "Type": 1,
    "MessageText": "Your order PEDIDO-4471 is on its way",
    "Devices": "573001234567",
    "CustomMessageId": "PEDIDO-4471"
  }'

// Node.js 18+
const BASE = 'https://rest.inalambria.com';

async function getToken() {
  const basic = Buffer.from(`${process.env.INALAMBRIA_USER}:${process.env.INALAMBRIA_PASSWORD}`).toString('base64');
  const res = await fetch(`${BASE}/token`, {
    method: 'POST',
    headers: { Authorization: `Basic ${basic}`, 'Content-Type': 'application/json' },
    body: JSON.stringify({ grant_type: 'password' }),
  });
  const { access_token } = await res.json(); // default lifetime: 4 hours
  return access_token;
}

const token = await getToken();
const res = await fetch(`${BASE}/mtmessage`, {
  method: 'POST',
  headers: { Authorization: `Bearer ${token}`, 'Content-Type': 'application/json' },
  body: JSON.stringify({
    Type: 1,
    MessageText: 'Reminder: your appointment is tomorrow at 8:30 am',
    Devices: '573001234567',
  }),
});
console.log(await res.json()); // { TransactionNumber, Status: 0 | 1, MessageText }

# Python 3 + requests
import os, requests

BASE = "https://rest.inalambria.com"
token = requests.post(
    f"{BASE}/token",
    auth=(os.environ["INALAMBRIA_USER"], os.environ["INALAMBRIA_PASSWORD"]),
    json={"grant_type": "password"},
    timeout=10,
).json()["access_token"]

resp = requests.post(
    f"{BASE}/mtmessage",
    headers={"Authorization": f"Bearer {token}"},
    json={
        "Type": 1,
        "MessageText": "Your October invoice is now available",
        "Devices": "573001234567-573007654321",  # several destinations separated by a hyphen
        "DateMessage": "2027-01-15 08:00:00",    # scheduled send (optional)
    },
    timeout=10,
)
print(resp.status_code, resp.json())

Frequently asked questions

What number format should I use?

For Colombia, 12 digits (57 + the 10-digit number). For the rest of the world, international E.164 format.

Is there a character limit?

The API does not enforce a strict limit, but we recommend staying under 500 characters. Long messages are concatenated and billed per segment.

Can I get my own short code?

Yes. We guide you through the application and set-up of a short code that belongs only to your brand, ideal for OTP, alerts and customer service.

Ready to communicate better with your customers?

Tell us about your needs and we’ll design the right solution with you, backed by more than 23 years of experience in Colombia.

Talk to an expert Read the docs