A wireless transceiver comprising: a tunable duplexer including transmission and reception channel filters (400; 402) of which transmission and reception channel filtering frequencies respectively are controlled by an external element; and a control portion for controlling the transmission and reception channel filtering frequencies to correspond to transmission and reception channels of a service band characterized in that the wireless transceiver is a multi-mode/multi-band wireless transceiver, wherein the multi-mode/multi-band wireless transceiver further comprises: transmission and reception routes (250, 252, 254, 244, 246, 248) corresponding to a plurality of service bands in a Frequency Division Duplex, FDD, mode and a Time Division Duplex, TDD, mode, respectively; a reception band switch for selectively connecting one of the reception routes (244, 246, 248), which corresponds to a current service band, to the reception channel filter, wherein the reception routes comprise a high band reception route, an intermediate band reception route, and a low band reception route for supporting signals of the plurality of service bands; and a transmission band switch for selectively connecting one of the transmission routes (250, 252, 254), which corresponds to a current service band, to the transmission channel filter, wherein the transmission routes comprise a high band transmission route, an intermediate band transmission route, and a low band transmission route for supporting signals of the plurality of service bands; wherein the control portion is further configured for controlling the transmission and reception channel filtering frequencies to correspond to transmission and reception channels of a current service band, wherein the control portion is further arranged for controlling the reception and transmission band switches to correspond to the current service band. a tunable duplexer including transmission and reception channel filters (400; 402) of which transmission and reception channel filtering frequencies respectively are controlled by an external element; and a control portion for controlling the transmission and reception channel filtering frequencies to correspond to transmission and reception channels of a service band characterized in that the wireless transceiver is a multi-mode/multi-band wireless transceiver, wherein the multi-mode/multi-band wireless transceiver further comprises: transmission and reception routes (250, 252, 254, 244, 246, 248) corresponding to a plurality of service bands in a Frequency Division Duplex, FDD, mode and a Time Division Duplex, TDD, mode, respectively; a reception band switch for selectively connecting one of the reception routes (244, 246, 248), which corresponds to a current service band, to the reception channel filter, wherein the reception routes comprise a high band reception route, an intermediate band reception route, and a low band reception route for supporting signals of the plurality of service bands; and a transmission band switch for selectively connecting one of the transmission routes (250, 252, 254), which corresponds to a current service band, to the transmission channel filter, wherein the transmission routes comprise a high band transmission route, an intermediate band transmission route, and a low band transmission route for supporting signals of the plurality of service bands; wherein the control portion is further configured for controlling the transmission and reception channel filtering frequencies to correspond to transmission and reception channels of a current service band, wherein the control portion is further arranged for controlling the reception and transmission band switches to correspond to the current service band. transmission and reception routes (250, 252, 254, 244, 246, 248) corresponding to a plurality of service bands in a Frequency Division Duplex, FDD, mode and a Time Division Duplex, TDD, mode, respectively; a reception band switch for selectively connecting one of the reception routes (244, 246, 248), which corresponds to a current service band, to the reception channel filter, wherein the reception routes comprise a high band reception route, an intermediate band reception route, and a low band reception route for supporting signals of the plurality of service bands; and a transmission band switch for selectively connecting one of the transmission routes (250, 252, 254), which corresponds to a current service band, to the transmission channel filter, wherein the transmission routes comprise a high band transmission route, an intermediate band transmission route, and a low band transmission route for supporting signals of the plurality of service bands; wherein the control portion is further configured for controlling the transmission and reception channel filtering frequencies to correspond to transmission and reception channels of a current service band, wherein the control portion is further arranged for controlling the reception and transmission band switches to correspond to the current service band.