When constructing the message for your SMS Marketing campaign you should be aware that not all characters are supported by the GSM networks. They have a specific character set that they work to. It shouldn’t be a major concern to 99%+ of people as almost all common characters are supported.
For your information here are a list of the supported characters;
Message Box will flag up any unsupported characters errors in your message, these errors tend to come when copying and pasting the messages as other applications will use a slightly different character. We would always advice that you type the message out and not to copy and paste.
For SMS Gateway customers, you will receive a fail response for any messages submitted with unsupported characters.