Its a nice app for a traveler like me. I frequent need to use calling card, dial international codes. Those codes and numbers have to insert before the contacts, however, iPhone is lack of the function called Edit Before Call which is common in Nokia or SE. With this app, I can insert my used/ new prefix, such as calling card, DTMF, International country codes without modifying the contacts one by one. Flexiable, easy to use, and save me alots of time. USD 0.99 make my life easiler! worth to buy !