HSL Global Network Coverage
List of all networks reachable through HSL.

Advanced Services Overview
General information on our SMS connectivity service.

Advanced Services - SMPP Interface Brochure
Specific information on SMS connectivity service and SMPP v3.x.

Advanced Services - Using Email for Sending & Receiving SMS (GMI SMTP)
Specific information on SMS connectivity and 2-way email.

Advanced Services - WebSMS
Specific information on the WebSMS solution.

Services pricing
Set-up, service levels, MSISDN allocation, alphanumeric originators, ...

SMS message pricing
Pricing for delivery of SMS by country. Volume discounting.

Advanced Services SMPP Interface Access
Form for applying for SMPP access to send/receive SMS.

Advanced Services HTTP Interface Access
Form for applying for HTTP access to send/receive SMS.

Advanced Services SMTP Interface Access
Form for applying for SMTP access to send/receive SMS.

Advanced Services Web Service Interface Access
Form for applying for Web Service access to send SMS.

SMPP (Short Message Peer-to-Peer)
SMPP v3.4 Specification
SMPP v3.3 Specification
SMPP Protocol Implementation Conformance Statement (PICS)
SMPP v5 Specification (informational only)

HTTP (simple)
HTTP Interface Specification for Sending and Receiving SMS v4

HTTP (sophisticated)
GMI HTTP Interface for 2-Way Messaging v3

Web Services
SOAP/XML Web Service
WSDL

SMTP (Email)
GMI SMTP Interface for 2-Way Messaging v7
SMTP Interface Specification for Sending SMS v2

WAP PPG (PAP over HTTP)
WAP Push Proxy Gateway Service Guide

HOWTO: Sending EMS Ringtones/Melodies to Mobile Telephones
HOWTO: Sending Ringtones to Sagem Mobile Telephones
INFO: An Introduction to the Noctor Java SMS Development Kit