METHOD AND SYSTEM FOR INTERNATIONAL ROAMING USING VIRTUAL SIM CARD

摘要

In a cellular telephone environment where SIM cards are used, a single SIM card is provided with a mechanism for supporting conventionally separate services that employ separate SIM cards, such as international calling from various countries, wherein the SIM card is enabled so that the user can dynamically load local SIM information by accessing a remote server (through GPRS/2.5G/3G or by receiving SMS data over the air) and enable the handset to obtain local wireless services.