International Direct Dialling and VoIP Services
The generic international call prefix when making an international call is 000, which all telecommunications service providers are required to share. However, the code is not well known as carrier-specific access codes are generally used, such as 001 for SingTel, 002 for M1 and 008 for StarHub. On a mobile phone, a plus sign (+) can be keyed in as a substitute for the prefix.
VoIP services, like Zone 1511, use prefixes in the 15xx range. For example, to call a number in London using Zone 1511, a subscriber would dial 1511 44 20 xxxx xxxx. hhAccess codes in the 0xx range (e.g. 018 - StarHub's VoIP services or 019 - SingTel's VoIP services) indicate a Tier 1 VoIP provider. Access codes like 1xxx (e.g. 1511) are indicative of a Tier 2 VoIP provider.
Read more about this topic: Telephone Numbers In Singapore
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