When did the 7 digit phone number start?
multipleQAs
When cities start to upgrade to the 7 digit format that included letters and numbers? When did the 7 digit all number telephone number format start?
1947 to 1951
1960 to 1981
Seven-digit dialing List of mobile telephone prefixes by country
7 digit phone number
Seven-digit dialing List of mobile telephone prefixes by country Telephone numbers in Cambodia Telephone numbers in Ukraine Ten-digit dialing Telephone numbers in Hong Kong Telephone numbers in Costa Rica North American Numbering Plan Telephone numbers in Singapore National conventions for writing telephone numbers
Seven-<b>digit</b> dialing is a telephone dialing procedure customary in the territories of 
the North ... 6 See also; <b>7</b> References ... A city telephone <b>number</b> consisted of an 
exchange name and four <b>digits</b>, such as &quot;Pennsylvania ... Several cities were 
upgraded in this period to seven-<b>digit</b> (two-letter-five-<b>number</b>) <b>phone</b> numbers. 91, Beeline Armenia, Users can now switch carriers and keep their cell <b>phone</b> 
numbers, including prefix ... So then they became standard &quot;<b>7 digit number</b>&quot; users
. The area code is 3 digits long, followed by a 6 or <b>7 digit phone number</b>. Calls 
made from outside Cambodia must omit the prefix 0. Therefore, to call a land line
&nbsp;... xxx-xx-xx (two PSTN <b>phones</b> within Kiev, local <b>number</b> is <b>7 digits</b> long) 050 xxx-xx
-xx (from any Ukraine <b>mobile</b> not roaming or PSTN <b>phone</b> to Vodafone, cell&nbsp;... The <b>phone</b> system often requires the caller to dial 1 first as a trunk prefix before 
the area code and <b>number</b>, to indicate to the <b>phone</b> system that the call requires 
a&nbsp;... Telephone numbers in Hong Kong are mostly eight-<b>digit</b>. Fixed land line 
numbers start with 2 or 3, <b>mobile</b> (cellular) <b>phone</b> numbers with 5, 6, <b>7</b> or 9, pager 
numbers with <b>7</b> and ... The telephone <b>number</b> for emergency services – Police, 
Fire Service and Ambulance – is 999 for all telephone lines. These numbers can 
also be&nbsp;... Also, all calls dialed using the old <b>7</b>-<b>digit</b> version of the <b>phone number</b> are 
automatically redirected to a voice message with information about the change. The North American Numbering Plan (NANP) is a telephone numbering plan that 
... Each telephone is assigned a seven-<b>digit</b> telephone <b>number</b> unique only 
within its ... 10- or 11-<b>digit</b> numbers when only <b>7</b>-<b>digit</b> dialing was previously 
permissible. ... In less than two years area code 612 again exhausted its supply 
of <b>phone</b>&nbsp;... Telephone numbers in Singapore, also known as the National Numbering Plan, 
are regulated ... Five <b>digits</b> were introduced in 1960s, whereas 5-<b>digit</b> and 6-<b>digit</b> 
<b>phone</b> numbers were ... From 1 April 2002 to 30 June 2002, the <b>7</b>-<b>digit</b> numbers 
will hear the change <b>number</b> announcement and after which calls will be&nbsp;... The national conventions for writing telephone numbers vary by country. While 
international ... It is usually written as (0XXX) YYYY YYYY (Some areas of the 
<b>phone number</b> in the format (0XXX) YYY YYYY), where 0 ... South Korean <b>phone</b> 
numbers can be as short as <b>7 digits</b> and as long as 11 <b>digits</b>, because, when 
making a&nbsp;...
1947
Seven-digit dialing