(
via) O2 have apparently announced that they will be offering landline numbers to (business) mobile users
here. £10 a month, £15 for an 0808, or free if you open a new account. No indication on that news release of any incoming call charges, though. They only say "your callers will be charged the standard landline rate for calling you – they won’t get charged any extra."
Didn't Orange used to offer landline numbers, albeit with incoming call charges?