▁devices . ▁In ▁that ▁proceed ing , ▁the ▁band ▁was ▁also ▁allocated ▁to ▁the ▁Am ateur ▁Radio ▁Service ▁on ▁a ▁secondary ▁basis ▁meaning ▁am ateurs ▁could ▁use ▁the ▁band ▁as ▁long ▁as ▁they ▁accepted ▁inter ference ▁from ▁and ▁did ▁not ▁cause ▁inter ference ▁to ▁primary ▁users . ▁▁ 9 0 0   M Hz ▁cord less ▁ph ones ▁In ▁the ▁mid - 1 9 9 0 s , ▁many ▁cord less ▁phone ▁manufact ur ers ▁started ▁producing ▁ph ones ▁that ▁used ▁the ▁lower ▁and ▁upper ▁ends ▁of ▁the ▁ 3 3 ▁cent imeter ▁band ▁for ▁communication ▁between ▁the ▁hand set ▁and ▁base . ▁These ▁ph ones , ▁which ▁are ▁reg ulated ▁by ▁Part ▁ 1 5 ▁of ▁the ▁F CC ' s ▁reg ulations , ▁have ▁made ▁amateur ▁use ▁of ▁the ▁upper ▁and ▁lower ▁end ▁of ▁the ▁ 3 3 ▁cent imeter ▁band ▁somewhat ▁tricky ▁due ▁to ▁the ▁number ▁of ▁these ▁ph ones ▁used ▁by ▁the ▁general ▁population . ▁Part ▁ 1 5 ▁devices , ▁by ▁law , ▁must ▁accept ▁inter ference ▁from ▁any ▁lic ensed ▁radio ▁service ▁with ▁which ▁they ▁share ▁frequencies . ▁▁ 9 0 0   M Hz ▁wireless ▁networking ▁In ▁the ▁early ▁ 1 9 9 0 s , ▁wireless ▁computer ▁networking ▁was ▁just ▁becoming ▁afford able . ▁ ▁Several ▁compet ing ▁techn ologies ▁emer ged ▁that ▁made ▁use ▁of ▁the ▁ 9 0 2 - 9 2 8   M Hz ▁Part ▁ 1 5 ▁band , ▁such ▁as : ▁ ▁N CR / AT & T /