A subscriber identity module card compatible apparatus, comprising: a base, a first card slot for a first subscriber identity module card to be inserted into, a second card slot for a second SIM card to be inserted into, and a stopper used for preventing the second SIM card from being inserted into the second card slot after the first SIM card is inserted into the first card slot as well as preventing the first SIM card from being inserted into the first card slot after the second SIM card is inserted into the second card slot, all of the first card slot, the second card slot and the stopper are arranged on the base, the first card slot is arranged in parallel with the second card slot, and the stopper is arranged between the first card slot and the second card slot, the apparatus being characterized in that the stopper comprises a fixed shaft, a first blocking portion for the first card slot and a second blocking portion for the second card slot on an opposite side of an inlet of the first card slot and the second card slot, the fixed shaft is fixed to the base, the first blocking portion and the second blocking portion are connected with each other, and both the first and the second blocking portion are rotatably connected to the fixed shaft, the first blocking portion is set to rotate around the fixed axis under an impetus of a card being inserted into the first card slot and extend with the card into the first card slot to make the second blocking portion rotate around the fixed axis in an opposite direction of the first blocking portion and extend within the second slot to a position of the inlet of the second slot to block insertion of other card, the second blocking portion is set to rotate around the fixed axis under an impetus of the other card being inserted into the second card slot and extend with the other card into the second card slot to make the first blocking portion rotate around the fixed axis in an opposite direction of the second blocking portion and extend within the first slot to a position of the inlet of the first slot to block insertion of the card. the stopper comprises a fixed shaft, a first blocking portion for the first card slot and a second blocking portion for the second card slot on an opposite side of an inlet of the first card slot and the second card slot, the fixed shaft is fixed to the base, the first blocking portion and the second blocking portion are connected with each other, and both the first and the second blocking portion are rotatably connected to the fixed shaft, the first blocking portion is set to rotate around the fixed axis under an impetus of a card being inserted into the first card slot and extend with the card into the first card slot to make the second blocking portion rotate around the fixed axis in an opposite direction of the first blocking portion and extend within the second slot to a position of the inlet of the second slot to block insertion of other card, the second blocking portion is set to rotate around the fixed axis under an impetus of the other card being inserted into the second card slot and extend with the other card into the second card slot to make the first blocking portion rotate around the fixed axis in an opposite direction of the second blocking portion and extend within the first slot to a position of the inlet of the first slot to block insertion of the card.