Voice SMS is service that make subscriber exchange a text message that usually sent by subscriber to short voice message. Voice SMS is a service for subscriber can sent short voice message with instantly. Subscriber can easily send voice SMS by dialing access number + recipients number, and subscriber follow the instruction to record a voice message. Length of voice SMS message is 20 or 30 seconds. And recipient will receive a SMS notification how to open the voice SMS or receive a call from voice SMS system and recipient will hear message of voice SMS. Method of the recipient receive the message is depending on Voice SMS system setting, and the setting are flexible up to the operators policy.