Android application for international calling

This application allows an Android user to use International long distance calling services seamlessly with native dialer. In summary, it has the following functionalities: 1. Activation: Collect various information from the phone/user (phone number, IMEI, IMSI, etc); send to backend server securely; get a couple of parameters back (dial access number, pin number, etc) 2. Call translation: When an international phone number is dialed, it is automatically translated to a local phone number plus DTMF tones 3. Enable/Disable: By default the service is enabled. It can be disabled manually, or automatically when certain conditions are detected. 4. Recharge: Recharge through google account, credit card, paypal; Backend takes care of the actual payment and account accreditation, etc. 5. Display rates: including checking for updated rates (obtained from backend server) 6. Various misc features: 1. detect SIM card change; when this happens, prompt for a new activation and don’t use existing payment/account info anymore 7. In the future, we will add SIP client and do VOIP call.