For land line area codes, the digit "0" is added in front when dialing domestic long distance from within Indonesia, but is always omitted when calling from abroad.

Until October 1999, East Timor was included in the Indonesian telephone numbering plan, using the area codes 0390 (for Dili)[1] and 0399 (for Baucau).

[2] To make a phone call to Indonesia from abroad, the following formats are used: For calls to landlines, callers dial +62, followed by the area code and subscriber's number, omitting the '0', hence a number in Jakarta would be dialled as +62 21-xxxx-xxxx.

For calls to mobile wireless phone (GSM) from abroad, callers dial +62, followed by the subscriber's number, omitting the '0', hence +62 8xx-xxxx-xxxxx On business cards and other contact information, telephone numbers might be listed as "HP" or "hunting".

Which X depends on empty slot of numbering plan, and may vary between cities.