An NFC-enabled device including tag emulation circuitry and reader emulation circuitry operates so as to provide a signal strength meter function. The apparatus includes an alerting device with an alerting element. By changing the transmission characteristic of each transistor in accordance with the magnetization states of Tr1, Tr2, Tr5, and Tr8 which are spin MOSFETs, it is possible to reconfigure all the two-input symmetric functions ANDORXORNANDNORXNOR\u201c1\u201d\u201c0\u201d. The method also includes generating a proposed response including price information based on the request and a plurality of payment service providers.