When was the last time you got a special price for your internet or phone service? Or when did you get a discount on dinner out? It was probably the last time you spoke up and asked for it.
In this world of competition bordering on cut throat tactics, consumers often have the edge - if we just take it. Businesses want your business, so if you tell them you're looking for a great deal, they will often deal with you.
If you see a "hooker" ad (one that promises a low fee for a limited time, but requires a contract of three to four times that), and you're already a customer, call the company and ask if they would give you the same courtesy. Why not? They can't say anything but "no," and they might very well say yes. They want to keep you as a customer, even if it means cutting your price temporarily.
If you see an ad from a competitor promising a good deal, call up your company and tell them you're considering switching. (You ARE considering it, but you don't have to actually switch.)
If you're having a hard time paying the bill, tell them so. Tell them that you'd like to remain a customer but simply can't afford it. They will usually work a deal with you.