Been ever get caught by some unknown phone call doing sales? Well, unless you have a good memories of what they are pitching and also alert and know what to ask, it is better off to drop the call. You would be getting second guesses what you have just bought. Had just got caught in this. It seems for some reason I got interested in the minimum cost for some upgrade, but somehow loses some info on some upgrade details. I was in an environment where I am not able to concentrate much. I should have just reject some strange number calls. Well, at least some effort made to call back and check on the details and managed to get some clear idea. You just need to be careful on what you agreed on, especially on some contract thing.