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Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
Further increased demand for telephone numbers in London led to the need for more number-space; rather than again split area codes, it was decided to merge the 0171 and 0181 area codes back into one but add an extra digit to the start of each London local number, thus increasing the available numbers by a factor of 5: 7 digit range = 200 0000 ...
From 1 October 2019, Ofcom has capped the termination or wholesale rate for calls to 070 numbers to be at the same level as for calls to mobile numbers. Ofcom "expect[s] this will allow phone companies to price calls to these numbers or include them in call allowances in the same way that they do for calls to mobile [number]s". [13]
Quick Take: List of Scam Area Codes. More than 300 area codes exist in the United States alone which is a target-rich environment for phone scammers.
Only certain sub-parts of each code were made available for immediate use. Numbers at 0845 7, 0845 9, 0870 1, 0870 4, 0870 5 and other ranges were set aside for numbers such as 0345, 0374, 0541, 0645 and 0990 that would be migrating from 9-digits to 10-digits and to these two 08xx codes in the forthcoming Big Number Change in 2000.
020: London [notes 1] [4] [5 ... numbers prefixed by 75 and transferred to 01595 on PhONE day. ... This enables local numbers to start with 0 or 1 and was introduced ...
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...