Christmas Island uses the Australian country code +61 and doesn't have a separate area code. Landline numbers begin with 8, mobile numbers with 4, and other number types have specific prefixes such as 1800, 1900, and 1300.

To call Christmas Island from another country, dial the international prefix (e.g. 0011), followed by 61, then the 8 or 9-digit subscriber number. Remember to drop the leading 0 from the local number if applicable.

Christmas Island phone numbers follow the Australian system, starting with +61 followed by an 8 or 9-digit number. Landlines start with 8, mobiles with 4, and special numbers like toll-free (1800) have dedicated prefixes.

The country code for Christmas Island is +61, the same as Australia. This is followed by 8 or 9 digit subscriber number depending on the number type.

Dial the 8-digit subscriber number directly when calling a landline within Christmas Island. From overseas, use the international prefix, country code +61, and the 8-digit number.

Use regex like `^8[1-9]\d{7}$` for landlines, `^4\d{8}$` for mobiles, and specific patterns for other types, like `^1800\d{6}$` for toll-free numbers. These expressions ensure correct format.

Christmas Island's telecommunications services are primarily handled by major Australian providers like Telstra, Optus, and Vodafone. Telstra dominates landlines and mobile services while Optus and Vodafone primarily offer mobile services.

Currently, Christmas Island does not have a dedicated number portability system. However, it falls under Australian telecommunications regulations which could apply regarding number portability.

Christmas Island has landline (starting with 8), mobile (starting with 4), toll-free (1800), premium rate (190X), and shared cost (1300) numbers. Each type follows a specific format within the +61 country code.

Christmas Island uses the Australian country code +61 because its telecommunications system is integrated with Australia's. This means calls to Christmas Island are dialed as if calling mainland Australia.

Dial the 9-digit mobile number, including the '4' prefix, when calling within Christmas Island. For international calls, dial the international prefix (e.g. 0011) then the country code +61 and then the 9 digit number.

Remove the leading '0' when dialing a Christmas Island number from overseas, after the country code +61. When calling domestically within Christmas Island, you'll use the full local number including any leading '0'.

Golden numbers (premium numbers with desirable sequences) may be available on Christmas Island, subject to availability and pricing from the telecommunications operators like Telstra, Optus, and Vodafone.