SHALL I THROW MY PHONE AWAY??

Alexandra Graham Bell 's telephone phone has come a long way and gone through many transformation and design. It has make communication between people from different part of the world at the click of a couple of button. For some they just can't leave home without it. I remember I once forgot to carry my phone half way to my office and actually turn back to get it.
It has being a wonderful tool, but at the same time I wonder if it has also brought inconvenience at time. Before you disagree, hear me out.
You are busy in the office and suddenly your phone ring, and the caller asked is that Mr. or Ms so and so and you answer yes. Then the caller  continued to inform you they are from such and such company and would like to extend you a free invitation for a stay at a certain star hotel. Sound familiar?? Such telemarketeers are very common now a days,especially those selling credit cards.
In the past I have been very patient and hear them out, but these days I could tell it is some kind of sales people the moment I answer them and so cut the conversation short and tell them I was not interested.Was I being rude ?? I do reliase they are just doing their job and I sure would not want people to cut me off like that if I were in their shoes?  On the other hand if I don't I would end up buying something I would regret later on.
What are your views?