the regulating authority at that time, introduced a policy framework which would govern IP telephony services, while introducing 8-digit phone numbers starting with the digit '3' for such services at the same time. Calls to Malaysia and Indonesian border towns Until 1995, calls to Malaysia from Singapore were direct and similar to domestic phone calls, with only the area code for fixed line or Malaysian mobile phone code and number being required, hence 03 for Kuala Lumpur fixed line or 019 for Celcom mobile carrier were dialed instead of +60 3 and +60 19. In 1995, owing to the divergence of the two countries' numbering plans, the Subscriber Trunk Dialling prefix 020 was adopted. For example, in order to call a number in Kuala Lumpur, 020 is dialled first, followed by the area code 3 (excluding the leading zero), then the subscriber number. Similarly, calls to Batam, Samarinda, Pekanbaru and Tanjung Pinang in Indonesia require only the code 011, followed by the area code (minus '0') and the subscriber's number, hence to call a number in Batam from Singapore, a subscriber would dial 011 778 xxx xxx, instead of the international code +62 778. Calls to the rest of Indonesia, including those to mobile phones, require international dialling. Following the liberalization of the telecommunications industry, new carriers are assigned new carrier-specific codes for international and regional trunk call services. The codes 020 and 011 are assigned to the incumbent carrier SingTel. The other two major carriers, M1 and StarHub, do not offer any special dialling arrangements for calling to Malaysia and Indonesia, instead requiring full international dialling, the same as calling other countries. Numbering scheme and format x denotes 0 to 9 y denotes 0 to 8 only Number ranges 3xxx xxxx - Business and Corporate IP Telephony Services or VOIP line numbers. 6xxx xxxx - Public Switched Telephone Network (PSTN) and Residential IP Telephony Services 8xxx xxxx - Mobile, Data Services, New Numbers and Prepaid Numbers 9yxx xxxx - Mobile, Data Services and Prepaid Numbers (Pagers Until May 2012) Special service numbers 800 xxx xxxx - Toll-free international services 1800 xxx xxxx - Toll-free domestic services (Free if calling from a landline. Airtime charges apply if calling from a mobile line. '1800' is alias for '6'; as such these services can be reached as toll numbers, including from outside of Singapore, by replacing '1800 xxx xxxx' with '+65 6xxx