An idea a day: 11. Develop mobile phone which can pick up phone calls inside your home. Everyone should have this experience: When you are sleeping nicely in your room, at the mid-night/ early in the morning, there is a fuzking guy call at your home's phone, if you want to stop the fuzking ring, you have to wake and walk outside. But if you can use an ordinary mobile phone, which can pick up anytime when phone ring, you can answer the ringing call at your finger tips. If you have a indoor mobile phone, this is an other case. Or mobile phone with this function can replace the "indoor mobile phone", as this is a "2 in 1" solution and mobile phone is now indispensible.