So hackers can easily use your wifi connection and use it. Better if they use for long hours and you will have a long bill but what if someone uses it for unlawful activities. So better prevention than cure. I have a good video from CNN-IBN here. I will start posting about the secure wifi once I will get it, may be in a day or two. I am sure that I will follow the instructions on the video. So, you guys never fallback.