A2P SMS Gateway

Reach customers globally with high-priority application-to-person SMS via direct operator routes.

99.98%

Deliverability Rate

< 2.5s

Average Global Latency

190+

Countries Supported

Direct Carrier Operator Routing

We bypass intermediary aggregators to connect directly to local tier-1 telecom operators. This ensures your high-priority transactional SMS alerts, notifications, and bulk marketing campaigns bypass bottleneck traffic queues with instant delivery and accurate carrier DLR receipts.

Carrier Route Health (Real-Time)
US OperatorEU GatewayAPAC RouteLATAM Core

Full SMS Unicode & Concatenation

Deliver messages in any language (including Cyrillic, Arabic, Chinese, and emojis) using full Unicode mapping. Our system intelligently segments and reassembles long multi-part SMS messages over 160 characters so your text flows perfectly without broken symbols or character replacement.

Your package order #9482 is out for delivery! 📦 Track progress: cellco.com/track-9482
Hello! Your special Cellco discount code is: SPIDER20 🕷️ Claim it today!
Telecom SMPP Protocols

Carrier-Grade SMPP v3.4 & REST Messaging Protocol

Engineered by senior telecom architects to deliver over 10,000 SMS per second via direct SMPP sessions and JSON REST webhooks.

Persistent SMPP Bindings

Maintain high-throughput transceiver binds directly into host SMSCs with automatic session reconnection and flow control.

GSM 03.38 & Unicode UTF-16

Full support for 7-bit GSM, 8-bit binary, and UTF-16 Unicode character sets with multi-part concatenated message assembly.

Sub-Second Handset DLRs

Real-time delivery receipts containing operator error codes (e.g. UNDELIV, DELIVRD, EXPIRED) pushed to your webhook endpoints.

Compliance & Registration

10DLC Brand Registration & TRAI DLT Pre-Approval

Cellco automates brand registration for US 10-Digit Long Codes (10DLC) and India TRAI DLT template pre-authorization, guaranteeing zero carrier blockage for your high-volume broadcast campaigns.

US 10DLC TCR Registered
TRAI DLT Template Engine
Developer Console

Production-Ready A2P SMS API Integration

Copy production-tested SDK snippets or test live JSON payloads directly in your environment.

curl -X POST https://api.cellco.io/v2/sms/send \
  -H "Authorization: Bearer cellco_live_key" \
  -d '{"to":"+15550123456","sender":"CELLCO","text":"Order #9821 confirmed."}'
Simulated Response 200 OK (42ms) 
{
  "status": "success",
  "message_id": "msg_9821a7f",
  "recipient": "+15550123456",
  "route": "Direct Tier-1",
  "cost": "0.0042 USD"
}
< 50ms API Latency TLS 1.3 Bank-Grade Encryption 99.99% SLA Uptime Guarantee