Mobile computing has been studied in the past few years on many respects: adaptive application, mobility model, data access and so on. However, most research aim at a general computing framework but not focus on a specific device, for example, mobile phone. Mobile phones are special due to some constraints compared with other devices and they currently serve as no more than passive terminals to a large extent. At the same time, mobile phones are probably the most popular device today. This paper describes an operative resource sharing model in the context of MIRES - a Mobile Information Resource Exchange System which facilitates convenient resource sharing among mobile phones. Techniques from distributed database systems are combined with such wireless technologies as GPRS and J2ME. With the versatile facilities of MIRES, a mobile phone user can easily share his/her personal resources or get others' resources at his/her own will anytime and anywhere.