It's very easy. You have to think about the lego, but instead of a piece of plastic you have a physical component of your smartphone.
There's a main piece and on it you put your new component, you switch on your smartphone and you're done.
Do you want a new camera? or a bigger battery? no problems from now.

"The wearables" are a specific type of smartphone that can be worn like a clock or a pair of glasses.
An example is the "google glasses". They have already been sold in America but the official launches is set for november.
The wearables are the most comfortable smartphones in the world. They have a lot of applications that allows people to use their smartphone everywhere without the risk of losing it.
In a world that evolve itself at a very big speed there's no time for think at all. In fact the electromagnetic waves created by these devices can be dangerous for our body.
Other problems arise when we use these things too much a long. The risk is of close ourselves in a virtual world created from the augmented reality.
The wearable smartphones have already had a technological leap.
The last big news comes from the CERN that has developed a contact lens which can increase our view.
Yes, we'll have a view 20 times more defined than now.

But this is not a wonderful project according to Google that has just invested milions of dollars in his intelligent contact lens.
Is enough? if no, google is developing a contact lens with sensors and cpu.
When google will launch this biological device the world will change. infact they can identify the eyes problem of a person and solve it.
dyslexia and myopia will solve in one second.