Couple of months ago I wrote a blog about testing anonymous TOR-network.
I got quite a lot of feedback why I stopped using TOR anyway. I have to admit that I still use TOR, but now I know better the weak point of this network "charity".
My ISP, Sonera, sent me this message by email, SMS, OnScreen notification and all of a sudden disconnected me from network.
The real reason was that I checked on my TOR-application to act as "exit-bridge" which caused about 2-3 GB of traffic to both directions during the weekend.
I asked permission ot try this beforehand and there was no rules about the "exit-bridge".
After blocking me offline I tried to sort out this issue by calling Sonera and asking permission to use TOR-exit-bridge. All I got was this: http://www5.sonera.fi/keskustele/viewtopic.php?f=92&t=8320
I clearly says there is NO restrictions at all.
Yes, I know, someone can spam e.g. ISP's smtp-server through my IP and I'm responsible for it because ISP is not able to trace the real spammer by IP. The same applies to this Open WLAN -case too: http://fin.afterdawn.com/uutiset/artikkeli.cfm/2012/05/14/oikeus_avoimen_wlan-verkon_haltija_ei_vastuussa_muiden_tekemisista
So, if you use Tor, don't put it in "exit-bridge"-mode because it forward a lot of anonymous traffic from Tor-network to public-internet and vice versa. All you get is problems from you ISP.
The thing you may be looking for - as I am - is the Tor relay (Tor bridge relay). It should be enough to be a volunteer to help Tor-users in censored countries to get anonymous access to free internet. It should not cause a lot of traffic or bandwidth.
If someone can provide more information about this I'm more than pleased to get advises how to configure Tor.