General SMS

How do I send long/multiple (concatenated) messages in one SMS?

How do I set up a user so they cannot view SMS message content?

What does it mean when a message has been ‘delivered to gateway’?

What is the difference between Short Codes, Free-to-End-User Codes, Long Numbers, and Toll-Free Numbers?

What is the difference between standard high-quality delivery and priority (time-critical) delivery?

What is the maximum length of an SMS?

Where do I find the correct Clickatell credentials for my third-party application?

Which mobile network carriers do you support?

Why am I not receiving my test SMS messages?

Why are my SMS messages not being delivered?

Other resources

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Developer docs

Developer docs

Access the latest technical information regarding Clickatell’s channels, products and APIs.

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