History
Until 1985, subscribers' telephone numbers in Singapore were five and six digits, but in that year, these changed to seven digits as the introduction of new towns arose (Tampines, Jurong East, Bukit Batok, Yishun and Hougang) and a large number of new numbers were required. Rationalisation was based on geographical locale over the 12 years.
In 1995, the digit '9' was added to mobile phone services, making numbers eight digits, and on 1 March 2002, the digit '6' was added to existing fixed line telephone numbers.
Read more about this topic: Telephone Numbers In Singapore
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