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
Non-geographic telephone numbers in the United Kingdom non-geographic numbers, designated Controlled Premium Rate Services (CPRS), is subject to additional regulation by the Phone-paid Services Authority (PSA), formerly PhonepayPlus. Ofcom's "PRS Condition" defines Controlled Premium Rate Services as those: Services identified as CPRS must comply with the PSA Code of Practice. Most non-geographic numbers use prefixes recovered from former use as geographic area codes. For previous uses of prefixes such as 0345, 0800 and 0990, see: List of dialling codes in the United Kingdom. During the 1980s, free-to-caller numbers were introduced using a range of prefixes that had previously been used as geographic area codes. By the 1990s,