We should also point out that, for simplicity’s sake, we’re assuming that all users have a phone number and that none of these phone numbers already include the area code. Depending on your setup those might not be safe assumptions to make. But that’s OK; it’...
There was a tie for first place Prefix (telecommunications) A set of digits placed before a telephone number, to indicate where the number is based, what type of phone number it is (landline, mobile, toll-free, premium rate etc.) In the UK, a number with an 0800 prefix is a toll-...
method and apparatus for composition facilitated of telephone numbers with prefix.ORIGA LUIGIORIGA MARCO
The telephone discriminator is for large national and international systems where the three selections corresponding to three prefix numbers are received by the same labelling group of four relays. Each first figure to be discriminated has an associated diode circuit between the pulse counting marking ...