I just got an SMS on my cellphone from an unknown number and it’s all about a promo for a low budget hotel. I don’t know how the sender got my number, but when my phone gives that message alert, it’s a bit annoying to read an unsolicited ad when you’re expecting important messages. Isn’t it that we usually meet sales agents at the malls offering real estate properties or educational books, or get proposals from online life insurance sites, but getting advertisements on your cellphone is just so bothersome, right?