| 摘要 |
<p>A mobile telephone SIM cards switching and selecting device is disclosed. The device includes a control circuit module which is mounted on a battery back cover or inside any other space that can accommodate it in a form of circuit board, a soft drop-out line and a common circuit board, the front end of which could be inserted into the SIM card slot of the mobile telephone. Assembling said components, inserting the common circuit board into the SIM card slot of the mobile telephone, the mobile telephone will possess several groups of identification numbers at the same time, and could select any group of SIM card to communicate by the control keys of the mobile telephone.</p> |
