Mobile phones use the prefixes 083, 085, 086, 087 and 089. 088 was previously issued to the Eircell analogue service. This has subsequently been issued to Digiweb. While mobile numbers are portable between operators, all new numbers are issued in an operators own allocation - 083 for 3, 085 for Meteor, 086 for O2, 087 for Vodafone and 089 for Tesco. The full number must be dialed even if it has the same prefix as the caller's number this is due to Eircell and Esat Digifone allocating numbers starting with 0 within their prefix range (for example 087 0xxxxxx).