A flash SMS is a type of text message that - without user action - appears directly and fullscreen on the mobile phone. Flash SMS is useful in case of emergencies or if you want to send confidential information, such as a one-time password (OTP).

You can send flash SMS through our API and via SMPP. It's not possible to send flash SMS via our web interface, yet you can do it through the API, you can find more information on how to do so in the SMS messaging section in our website for developers. 

Benefits of using Flash SMS:

• Users can't ignore your message because it appears fullscreen and the user actively needs to close it.
• It's safer than standard SMS because the message isn't stored in the inbox.
• In case the Flash SMS isn't supported by an operator or mobile phone, the message is still sent as a standard SMS.