For me it's ATT. Feel like I'm in bondage to them. Seems all the carriers have now colluded to force customers to pay for phones. Gone are he days of discounts in return for a. 2 year contract.
They still give the discount but charge more for service if you take it. Horrible company too deal with too.
Close second is any airline. Scumbags all! They have raised the bar to new heights in an effort to screw their customers as much as they are willing to take. Once they see a competitor get away with a new fee, they all quickly follow suit. Pretty soon all airlines will be like Spirit if you buy the lowest fare ticket. Just wait.