It comes in through the landline box, but I do not have a number or handset in the house. You need to request that facility, which I didnt.
ive done the form a couple of times now and there is no need to put your land line number its just a contact number and a contact for a next of kin...
they can of course check you are putting the correct info in there and not bollox for which they can check and you could be fined..a subtle difference...