Portugal changed to a closed telephone numbering plan on 31 October 1999; previously, the trunk prefix was '0', but this was dropped.

[1] For special number ranges, formerly ten digits were used, but the initial '0' was dropped.

[1] These changes made that nine digits were used for all calls after 1999.

[2] On 16 December 1999 Anacom announced that the market would be opened to competitors on 1 January 2000.

[2] Numbering examples for Lisbon area:[1] Mobiles similarly changed, with the digits 9T replacing the prefix 093T, where T is a digit specific to a mobile operator, that can be 1 (Telecel, now Vodafone Portugal), 0, 2 or 6 (TMN/MEO) or 3 (Optimus/NOS): New number ranges include:[3] Source:[4]