Search Results for: Transmission apparatus for television with incorporated sound recording
example, the phone of an omaha, nebraska–based rcc service would not be likely to work in phoenix, arizona. roaming was not encouraged, in part, because there was no centralized industry billing database for rccs. signaling formats were not standardized. for example, some systems used two-tone sequential
rcc's existence, industry associations were working on a technical standard that would have allowed roaming, and some mobile users had multiple decoders to enable operation with more than one of the common signaling formats ( / , , and reach). manual operation was often a fallback for rcc roamers. other...
https://en.wikipedia.org/wiki/History_of_mobile_phones