QUALITY CONTROL!


>> http://consumers.ofcom.org.uk/phone/numbering/dial-the-code/
>>
>> Due to telephone number exhaustion, they're asking everybody to upgrade
>> to IPv6 - er, I mean, they're changing the numbering plan.
>>
>> Currently, all area codes start with 0. But that means you cannot assign
>> anybody a telephone number that starts with 0, see? So they're making it
>> so you always have to dial the area code. That way, we know it's the
>> area code because it's at the beginning of the number, not because it
>> starts with a 0.
>>
>> Rather than, say, add new area codes or something, which would only
>> affect people assigned these new numbers.
>
> that's the goal.
>
> Now that people always have to dial the 10 digits, you no longer need:
>
> if ( first digit == 0 )
> then { expect 10 digits because it's a long-distance call}
> else { expect 8 digits because it's a local call}
>
> So you can introduce new area codes that start with any number.
>
> In North America, it used to be that the 2nd digit of the area code had
> to be 0 or 1, and the 2nd digit of the exchange couldn't.  This was
> because the selectors were hard wired to route the call to external turnks.
                        ^                                              ^^
                        in the phone swith                         trunks

>
> In the mid 90s, when cell phones became popular, they removed that
> restriction since by then, all phone switches were digital and you no
> longer had that hard-wiring restriction.  this allowed them to create
> new area codes that had any digit in the 2nd position, as well as
> assigning local exchanges with 0 or 1 in that position.  Giving north
> America 800 new available area codes, and each area code 20,000 new
                                                            ^^^^^^
                                                           200,000
> possible numbers.
>
>


-- 
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