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List of area codes Old format New format [1] Place/service +251 1 xxxxxx +251 11 1xxxxxx: Addis Ababa North +251 1 xxxxxx +251 11 2xxxxxx: Addis Ababa West
Some methods include push-based authentication, QR code-based authentication, one-time password authentication (event-based and time-based), and SMS-based verification. SMS-based verification suffers from some security concerns. Phones can be cloned, apps can run on several phones and cell-phone maintenance personnel can read SMS texts.
Land line phone numbers in Kenya follow the format Area Code + Phone Number. To dial a number within an area or city, only the phone number needs to be dialled. When dialling from a different area or city, the telephone number is dialled in the format 0 + Area Code + Phone Number. When dialling from abroad, the 0 is omitted.
The total length of all phone numbers (area code and the phone number) is constant at 10 digits. For example, the number 7513200000 signifies the area code 751 (the area code for Gwalior) followed by the phone number. Fixed-line or landline numbers are at most 8 digits long.
For VoIP accounts providers the ministry reserved the operator code 09 Calls from outside Algeria +213 9xx xx xx xx. But today the landline provider Algerie Telecom is using voip technology to serve landlines because they replaced ADSL/VDSL with fiber optic which makes VoIP with an embedded VoIP to landline circuit in their modem the ideal solution to keep landline for this exception Algérie ...
In mainland China, mobile phone numbers have eleven digits in the format 1xx-XXXX-XXXX (except for 140–144, which are 13-digit IoT numbers), in which the first three digits (13x to 19x) designate the mobile phone service provider. Before GSM, mobile phones had 6-digit (later upgraded to 7-digit) numbers starting with nine.
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