Not a complete answer
Femtocells need a physical broadband connection to complete the loop. I have the problem of a totally 3g environment with no broadband by wire but where 250cm stone walls backed by aluminium faced plasterboard mean no 3G penetration depsite transmitter within a mile. So far the Huawei mobile broadband dongle hung out of the window on a USB repeater works for the PC but phones are a different matter as Sony Ericsson can't seem to grasp that their aerial sockets need the owner to buy a compatible plug or a hen's tooth whichever is easier to find. I don't want to have to sit outside to use the phone.
Solutions need to be found to enable a truly wireless environment and not depend on there being wires to a nearby exchange.
Am trialling a potential solution from mobdev.