Do you think the carriers will willingly, and out of the goodness of their hearts, lower the bill and give money back to you?? How can you expect them to say no to that free revenue?

Over here a given phone gets cheaper the bigger the plan is. And generally every year you can can update your phone for a reduced price, but if you don't change, or you supplies your own phone, the cost of a given plan remains the same. No company in the world would let such easy money go out the door.

I remember seeing a show about the construction of the new building for the Mexican Senate. They build several sub surface levels by drilling deep columns of support, pouring a giant slab with a few holes and excavating the dirt of a level underneath and repeating the process. When they got to the fourth or fifth level down, they realized that the flow of water and silt under the building against the columns had tilted the columns enough that the vector of weight of the upper levels fell outside the base of the column, and they had to wrap the columns with additional concrete and reinforcemente making them way wider on all the levels.
If the volume of flow, just 4 to 5 levels down, against just the width of a column, is capable of displacing it so much, imagine the force against something the size and depth of this. And it will vary greatly with depth, until you get to rock, if there is some reachable down there.

Then raise it more. There are lots of places in Mexico City that would be flooded but for the MASSIVE draining system, so build up those sites, while you wait for the new building to fail in any of several amusing ways that have been sugested in other comments.

According to this photo, it can work in single screen mode
http://www.gscreenlaptop.com/assets/images/gScreen-SpaceBook-dual-screen-laptop-002(5).jpg

or in screen and half mode
http://www.gscreenlaptop.com/assets/images/gScreen-SpaceBook-dual-screen-laptop-002(7).jpg

and I think that Samsung or someone made a portable screen like you ask for, even connectable by usb