AMPS Spectrum and Allocation
A band set up for independent carriers
B band set up for traditional wireline carriers, such as
the Regional Bell Operating Companies (RBOC)
idea was to ensure competition in all markets, while
restrict potential proliferation of companies that would
complicate spectrum allocation/management
today, many independent carriers bought by RBOCs, so
it is not uncommon to have one company operating in
Band A in one market and Band B in another market
channels always come in pairs, spaced 45 MHz apart