<Li> Dublin 01 numbers changed from 6 to 7 digits in five stages between 1990 and 1994: <Ul> <Li> On April 2nd 1990, numbers beginning 23, 24, 26, 27, 28, 70 and 79 were prefixed with 6 . </Li> <Li> On April 8th 1991, numbers beginning with 8 and 69 were prefixed with 2 . </Li> <Li> On April 4th 1992, numbers beginning with 4 and the remaining 6 - digit numbers beginning with 2 were prefixed with 8 . Numbers beginning 95 and 98 were prefixed with 2 . </Li> <Li> On April 24th 1993, numbers beginning 75, 780, 781, 782, 783 and 784 were prefixed with 4; numbers beginning 60, 61, 68, 71, 76, 77, 785, 789 were prefixed with 6; and numbers beginning 72, 73, 74, 786, 787, 788 were prefixed with 8 . </Li> <Li> On April 16th 1994, numbers beginning 3 were prefixed with an 8; numbers beginning 5 and 9 were prefixed with 4 . </Li> </Ul> </Li> <Ul> <Li> On April 2nd 1990, numbers beginning 23, 24, 26, 27, 28, 70 and 79 were prefixed with 6 . </Li> <Li> On April 8th 1991, numbers beginning with 8 and 69 were prefixed with 2 . </Li> <Li> On April 4th 1992, numbers beginning with 4 and the remaining 6 - digit numbers beginning with 2 were prefixed with 8 . Numbers beginning 95 and 98 were prefixed with 2 . </Li> <Li> On April 24th 1993, numbers beginning 75, 780, 781, 782, 783 and 784 were prefixed with 4; numbers beginning 60, 61, 68, 71, 76, 77, 785, 789 were prefixed with 6; and numbers beginning 72, 73, 74, 786, 787, 788 were prefixed with 8 . </Li> <Li> On April 16th 1994, numbers beginning 3 were prefixed with an 8; numbers beginning 5 and 9 were prefixed with 4 . </Li> </Ul> <Li> On April 2nd 1990, numbers beginning 23, 24, 26, 27, 28, 70 and 79 were prefixed with 6 . </Li> <Li> On April 8th 1991, numbers beginning with 8 and 69 were prefixed with 2 . </Li>

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