A method of reducing the fouling propensity of a hydrocarbon feed stream having a Total Base Number based on ASTM method D2896-11 of less than 150 ppm andor a P-value according to ASTM method D7060-09 of less than 1. Furthermore, embodiments of the invention provide a method and system for utilizing mobile telephone features with a landline telephone. The light absorber includes at least one thermistor layer having a resistance value that varies according to temperature and at least two resonator layers disposed on at least one of upper and lower surfaces of the at least one thermistor layer.