Abstract: A rectangular recessed portion is formed on the upper surface of the transceiver of a portable telephone set for receiving a SIM card. A plurality of contacts are disposed on a base plate which is disposed under the rectangular recessed portion and above a printed circuit board of the transceiver without directly contacting the printed circuit board. The rectangular recessed portion has a plurality of slots formed on the bottom thereof. Each of the contacts protrudes from the corresponding slot of the rectangular recessed portion to couple to the electrical contacts of a SIM card, and has an extended end electrically connected to the contacts of the printed circuit. The recessed rectangular recessed portion has an inclined plane for facilitating the loading of the SIM card.