Before installing this app, first install the Telerivet SMS Gateway app (https://play.google.com/store/apps/details?id=com.rivetlabs.sms) on your Android phone. Then, install the USSD Expansion Pack.
After installing the USSD Expansion Pack, you must reboot your phone before USSD functionality is enabled.
Then, you can use the Messages page on Telerivet.com to send USSD requests via your phone and view the responses. Developers can also send USSD requests and receive responses in their own applications via the Telerivet API.
NOTE: The current version of the Telerivet USSD Expansion pack does not support USSD menus (where the network sends a USSD response that prompts you for additional input), such as the M-Pesa service in Tanzania.