Telephone numbers in Singapore digits. Five digits were introduced in 1960s, whereas 5-digit and 6-digit phone numbers were introduced in 1960s as fixed lines grew, 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 the front of mobiland pager numbers, making numbers eight digits, and on 1 March 2002, the digit '6' was added to the front of existing fixed line telephone
Telephone numbers in Costa Rica Telephone numbers in Costa Rica Country Code: +506<br> International Call Prefix: 00 Number plan type: closed As of 2010 the government body in charge of allocations is the Superintendencia de Telecomunicaciones SUTEL (In Spanish) Prefix 00 was reserved for international calls, while prefix 9 was assigned to special numbers, such as 9-1-1. Toll-free numbers start with 800 followed by 7 digits while premium-rate numbers start with 900 followed by 7 digits. Before 1994, all phone numbers in Costa Rica were six digits long. The Instituto Costarricense de Electricidad, which at that time had the monopoly on telecommunications, introduced a system