A short code is a number that is much shorter than a regular phone number – usually 5/6 digits – but it can vary from country to country. This 5 or 6 digit 'from' number can easily be memorized by your customers, suppliers, or employees. These numbers can send text messages to mobile phones and receive messages from mobile phones. They are often used for marketing and promotional messaging.
The advantage of short codes is that they can be easily remembered, making it simple for recipients to reply to your messages. Short codes are registered by a national registry in either random (any numbers) or vanity (specific numbers chosen by you). Short codes are ideal for high volume incoming and outgoing mobile text messages.
Short codes require an application process and are not available immediately. Short codes are also country-specific and can't be used if you want to receive messages from international customers.