USSD is a method of sending messages in a GSM network. Of course, this feature component capabilities inherent in the network should not be considered, and for this reason, the service component of the value-added service of GSM network is considered that without the cost of certain significant add to all GSM networks. On the other side, almost all the phones available from the send and receive such messages support.

communicate messages through USSD very many similarities to transfer the message via text message(SMS), but despite all of these similarities, a big difference between the two is available, and it in how to transfer the information. SMS of the mechanism, save and send Re - * (Store And Forward) use the same while USSD meeting oriented(Session Oriented). This means that the SMS after receiving in the network will be saved and at another time to the destination is sent, but in the USSD message in the same time, send the get Will was. The major difference the other is that USSD is a method of communicating between the phone network and vice versa, but the SMS to connect the phone, the phone goes to work.

You can use the phone with, yourself messages, USSD desired to send.

from such applications, USSD can be used to:
- prepaid phone
- electronic banking
- chatting
- game Network
- ...
cited.