0870 numbers are non-geographic numbers, often referred to as national numbers.
Your inbound callers only pay a national rate call charge from anywhere in the UK when dialling your 0870 number.
Calls to an 0870 number from a standard BT landline line will cost the caller (including VAT):
7.91p (Daytime)
3.95p (Evening)
1.5p (Weekend)
* 0870 numbers are currently undergoing some changes - offcom link
Other choices are
0845 Numbers
0844 Numbers
