in 1997 and 1998, mobile, non-geographic, and premium rate numbers started to be issued with ten digits and using only specific new prefixes: 070 for personal numbers, 076 for pagers, 077xx, 078xx and 079xx for mobiles, 0800 and 0808 for freephone, 0845 and 0870 for non-geographic revenue-share numbers and 090x for premium rate numbers. within each of these groups some smaller number blocks were held aside for the older 9-digit mobile, non-geographic and premium rate services to move into at a later date. in 2000 and 2001, the big number change put those final parts into place and they are detailed below.