1. A method for making calls from a wireless communications device in a source country outside of a home country, the method comprising: obtaining one or more call plan proposals associated with one or more service providers, wherein each of the one or more call plan proposals includes a call price, a country access code, and a discount identifier code; receiving a destination phone number for making a call on the wireless communications device (WCD) when the WCD is in the source country; determining the source country from which the call is to be made, wherein the source country corresponds to the current country location of the WCD; determining a destination country code of the destination phone number; identifying each of the one or more call plan proposals available to the WCD in the source country, wherein each of the one or more call plan proposals comprises a plan-specific discount identifier code; selecting a call plan proposal from the identified available call plan proposals; generating a destination number string comprising the destination phone number combined with the destination country code and the country access code and the discount identifier code of the selected call plan proposal; and executing the call using the destination number string.