I was thinking about how different our lives will be as cell phone technology continues to improve. Someday your phone will be your only computer, and your home will have a screen in every room that senses the proximity of any phone that approaches. Push a button on your phone and it will take over any nearby screen to display a movie, recorded TV show, or music video. You could browse the web on the big screen, or create a Word document. You might want a wireless keyboard in some rooms, but for most applications your phone would control the cursor and allow you to do minor typing.
If you have no nearby screen, the phone could project a larger image onto any surface. That technology is already on the market.
As you walk from room to room, your TV show or music would automatically follow you, at least in your own home, assuming no one else has control of the screens in those rooms. And your phone would be the universal remote control for everything in the home, including lights, temperature, and security.
When you go to work, you simply approach your cubicle and the phone in your pocket wakes up the screen and becomes its processor, communicating with the screen and the Internet. The phone would have massive data storage, and back itself up automatically over the Internet. If you lose your phone, all you need is your security codes and passwords to be up and running with a new phone in an hour.
Wallets will become relics. Just wave your phone near a point of sale terminal, enter your PIN code on the phone and your bank account will be debited. Or perhaps by then your phone will read your thumb print to verify your identity.
When you shop, just wave your phone over the bar code on a product and see reviews and comparisons.
As you approach your car, it senses your phone's proximity and unlocks the doors nearest you and adjusts the seats for you.
All of this technology already exists in some form, or will soon. In the future, the only computer you will ever need will be in your pocket.