(1)General conditions may impose such requirements as OFCOM consider appropriate for securing that every end-user of a public electronic communications service is able, by means of that service—
(a)to make calls or otherwise transmit electronic communications to every normal telephone number; and
(b)to receive every call or other electronic communication that is made or transmitted to him using such a service from apparatus identified by a normal telephone number.
(2)A normal telephone number is one which—
(a)has been made available, in accordance with the National Telephone Numbering Plan, as a number to be used for the purpose of identifying the destination for, or the recipient of, electronic communications; and
(b)is for the time being—
(i)a number adopted by a communications provider to be used for such a purpose; or
(ii)a number in use for such a purpose by a person other than a communications provider to whom it has been allocated in accordance with conditions under section 59.
(3)In this section “electronic communication” has the same meaning as in section 56.