Clockwork SMS API
Documentation
Everything you need to know

GSM Character set

This page lists all the characters supported in a standard text message. All text should be UTF-8 encoded when using Clockwork.

Standard characters

@ £ $ ¥ è é ù ì ò Ç <LF> Ø ø <CR> Å å
Δ _ Φ Γ Λ Ω Π Ψ Σ Θ Ξ <ESC> Æ æ ß É
<SP> ! " # ¤ % & ' ( ) * + , - . /
0 1 2 3 4 5 6 7 8 9 : ; < = > ?
¡ A B C D E F G H I J K L M N O
P Q R S T U V W X Y Z Ä Ö Ñ Ü §
¿ a b c d e f g h i j k l m n o
p q r s t u v w x y z ä ö ñ ü à

Extended Characters

Each of these characters will count as two characters within the text message.

€ <FF> [ \ ] ^ { | } ~

Code Wrappers

  • C# wrapper
  • Java wrapper
  • Node.js Wrapper
  • PHP Wrapper
  • Python Wrapper
  • Ruby gem
  • VB.NET wrapper

Email Interface

  • Send SMS via email

HTTP Interface

  • Check your credit via HTTP
  • SMS Delivery Receipts via HTTP
  • Receive SMS via HTTP
  • Send SMS via HTTP

XML Interface

  • Check your credit using XML
  • SMS Delivery Receipts in XML
  • Receive SMS in XML
  • Send SMS using XML

Reference

  • API Error Codes
  • Delivery States
  • GSM Character set