0345 numbers are quite a new number extension. They are specially allocated to a fixed number of businesses / industries which need to specifically request one. You will find local councils, Government run organisations, public services, charities and other non-profit organisations using them. So you can expect 0345 numbers to start being used more and more as we go forward.
It doesn’t matter if you are calling a 0345 number from a landline or and mobile the call cost is exactly the same.
Calling a 0345 number will cost exactly the same as a call to a standard landline number starting with 01 and 02.
If you have “free” minutes as part of your phone deal then calls to 0345 numbers will come out of that and there will be no additional charges on your bill.
0345 numbers are non-geographic numbers that have been assigned by Ofcom to replace 084 and 087 numbers.