Do high frequency oscillations use more than one bandwidth
A modulated radio signal has non-zero bandwidth.  The modulation signal that carries the information has a much lower max frequency compared with the carrier frequency, keeping the total bandwidth (carrier plus both modulation sidebands) of an AM signal within FCC legal limits.

Other modulation schemes are used for GSM/3G, such as OFDM, that create more widely spaced sidebands, but the carrier frequency is so much higher (GHz range) than the modulation sideband width, that the resulting signal bandwidth is only a tiny fractional slice of the total RF spectrum.