Femtocell's Future

I've just heard of these devices called Femtocells which seem to be used as something related to minature cell phone towers that can be added by individuals. I remember always seeing those cell phone boosters that go on the back of phones and at first I thought they were talking about them, as they're trying to recieve a signal in buildings, but then upon reading further, I realize they function sort of like a cell phone tower does, except it takes the signal and sends it out through the wifi network.

I'm guessing that the cell signal is stronger then the wifi network and that's why they do this. Otherwise, I'm thinking that they should just have the cell phones use wifi when it's available to transmit the voice/data over the network instead of through the cell carrier. But I'm sure the cell phone companies want all the data going through them as that's how they get paid, haha.

None the less, I don't see why the cell companies don't just team up with Cisco and automatically install this cell in their routers. Or at least have only a slightly more expensive version that does. I mean, with the diminishing cost of supply that tech has, it should lower the expense of the devices to very cheap and then they can boast that there is service at more points then any other company, etc. I'm probably missing something about it. There's probably an issue with people using other's wifi networks and the fact that if the network's secure it might not works. Maybe I'm just misreading the article. Either way, I think this topic deserves some discussion.

I read the initial article at: http://online.wsj.com/article/SB125115911718255359.html