Why? Cause they will not upgrade your plan for free if the speeds increase in between. I had bought a yearly plan of 2Mbps from my ISP (was getting a month free) in January this year. Unknown to me around Jan end they doubled the speeds from 2-4Mbps for the same price. Was looking at their site today and saw the new plans. Called the CC. After a few minutes of talking and some hold time listening to elevator music, I was given only one option - if I wanted the new plan speeds for the remainder of the duration I had paid, they wanted me to pay extra money. I said no. CC said they couldn't do anything else. So it is like a year's loss of money to me now. Stuck at low 2Mbps speeds instead of 4. So don't pay for more than 3 months now. Data plan prices are decreasing everywhere and even small ISP's are reducing their prices.