A mobile phone, comprising a Near Field Communication, NFC, module (101, 201, 301, 401), an alarm (103, 203, 303, 403), a control circuit (102, 202, 302, 402), and a battery (104, 204, 304, 404), wherein the control circuit is connected to the NFC module (101, 201, 301, 401) and the alarm, and the control circuit comprises a flip-flop, a switch chip, and a counter; the battery is directly connected to the NFC module (101, 201, 301, 401), the control circuit and the alarm (103, 203, 303, 403), and the battery (104, 204, 304, 404) is configured to output a voltage to supply power to the NFC module (101, 201, 301, 401), the alarm (103, 203, 303, 403), and the control circuit for normal running, when the mobile phone is in a power-off state; the counter is connected to the flip-flop and the NFC module (101, 201, 301, 401); the NFC module (101, 201, 301, 401) is configured to perform a card swiping operation according to a received card swiping request, and generate an interrupt signal, when the mobile phone is in the power-off state; the flip-flop is configured to output a first toggle signal according to the interrupt signal output by the NFC module (101, 201, 301, 401), wherein the first toggle signal is used to indicate that an output status of the flip-flop is toggled; the switch chip is configured to start the alarm (103, 203, 303, 403) according to the first toggle signal output by the flip-flop; the alarm (103, 203, 303, 403) is configured to send an alarm signal, when the mobile phone is in the power-off state; the counter is configured to: start counting according to the interrupt signal generated by the NFC module (101, 201, 301, 401), stop counting when a count reaches a preset value, and generate a counting stop signal; the flip-flop is further configured to output a second toggle signal according to the counting stop signal generated by the counter, wherein the second toggle signal is used to indicate that the output status of the flip-flop is toggled; and the switch chip is further configured to turn off the alarm (103, 203, 303, 403) according to the second toggle signal output by the flip-flop. the control circuit is connected to the NFC module (101, 201, 301, 401) and the alarm, and the control circuit comprises a flip-flop, a switch chip, and a counter; the battery is directly connected to the NFC module (101, 201, 301, 401), the control circuit and the alarm (103, 203, 303, 403), and the battery (104, 204, 304, 404) is configured to output a voltage to supply power to the NFC module (101, 201, 301, 401), the alarm (103, 203, 303, 403), and the control circuit for normal running, when the mobile phone is in a power-off state; the counter is connected to the flip-flop and the NFC module (101, 201, 301, 401); the NFC module (101, 201, 301, 401) is configured to perform a card swiping operation according to a received card swiping request, and generate an interrupt signal, when the mobile phone is in the power-off state; the flip-flop is configured to output a first toggle signal according to the interrupt signal output by the NFC module (101, 201, 301, 401), wherein the first toggle signal is used to indicate that an output status of the flip-flop is toggled; the switch chip is configured to start the alarm (103, 203, 303, 403) according to the first toggle signal output by the flip-flop; the alarm (103, 203, 303, 403) is configured to send an alarm signal, when the mobile phone is in the power-off state; the counter is configured to: start counting according to the interrupt signal generated by the NFC module (101, 201, 301, 401), stop counting when a count reaches a preset value, and generate a counting stop signal; the flip-flop is further configured to output a second toggle signal according to the counting stop signal generated by the counter, wherein the second toggle signal is used to indicate that the output status of the flip-flop is toggled; and the switch chip is further configured to turn off the alarm (103, 203, 303, 403) according to the second toggle signal output by the flip-flop.