These are National Rate Numbers and can be advertised as such.
Companies of all sizes are
now using 0870 numbers for lots of reasons, common uses include customer
help desks, order lines and advertisement response lines. If you are
issuing an 0870 number your location is totally unknown to the caller.
As with
all our non-geographic services, 0870 numbers can be placed on fax
machines, DDI ranges, modem banks and any UK fixed landline number
For a 0870 number the caller
is charged the BT National Rate and peak, off-peak, and weekend rates are
applicable.