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Mobile phone numbers are always 10 digits (three digits for the service provider, plus a seven-digit number). When making long-distance calls in the Philippines, the prefix 0 for domestic calls and 00 for international calls are used.
In theoretical computer science and cryptography, a pseudorandom generator (PRG) for a class of statistical tests is a deterministic procedure that maps a random seed to a longer pseudorandom string such that no statistical test in the class can distinguish between the output of the generator and the uniform distribution.
It is not possible to determine unambiguously the end of a phone number from a prefix or the digits already dialed. This feature allows the extension of the length of phone numbers without revoking or changing existing numbers. Mobile telephones are assigned to non-geographic codes, making them readily recognizable.
The electric generator of the telephone is wired in sequence to two dry cell batteries so that the instrument can be used to administer electric shocks to another person. The Tucker Telephone was invented by A. E. Rollins, [ 1 ] the resident physician at the Tucker State Prison Farm , Arkansas , in the 1960s.
A telephone number serves as an address for switching telephone calls using a system of destination code routing. [1] Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.
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
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