Click SMS has been supplying reliable, innovative and competitively priced text messaging services and solutions since 2002
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SMS API
The Click SMS gateway API provides access to our SMS messaging server via XML over HTTP requests.  The SMS API provides an easy to implement, uncomplicated solution for integrating SMS text message sending into your organisation's web or business applications.

Schedule SMS text messages for future delivery.

Specify a destination URL to receive SMS delivery notifications.

Set the SMS message sender id - numeric and alphanumeric.

Send long SMS messages up to 459 characters in length.

Request the number of SMS credits remaining on your account.

High quality routing; SMS delivery direct through UK mobile networks.

Documentation:
SMS API Technical Specification v2.0
SMS API Technical Specification v1.02 - PHP Code Examples v1.02.

Test the SMS Gateway API with a free Trial Account.

There are no charges for using the Click SMS gateway, just the cost of SMS message credits.  Check Prices for details of SMS message costs.  Please Contact us if you require any additional information.