> Internet? Wait until the moment your "promo" cost ends and your bill goes from $80 to $150, threaten to quit, oh wow magically you can have $80 again and a free mobile phone line.

Careful though. Companies are catching on to the "threaten to cancel" trick. Last time I tried this with Comcast, the support rep put me on hold, and then instead of sending me over to the "retention" specialist, just canceled my service and asked if I needed anything else. Oops..