The answer is no. What determines maximum channel capacity is spectrum width not absolute value. For example 700 - 720 MHz would have the same potential capacity as 28000 to 28,020 Mhz. 28,000 to 28,160 Mhz could potentially have 40 times. 700 Mhz is much better spectrum than 28 GHz because lower frequencies have lower attenuation rates and travel further with acceptable signal to noise ratio. Lower frequencies are also much better going through walls. That's why Verizon and others paid so much for it.

On September 23, 1993 the Federal Communications Commission (FCC) authorized 160 MHz of spectrum for PCS

On September 23, 1993 the Federal Communications Commission (FCC) authorized 160 MHz of spectrum for PCS

Neither. It runs on a 700 MHz ARM11 processor, underclocked to 400 MHz.

The visible light spectrum (wavelengths from 380 to 700 nanometers)