This is more of a question or suggestion for developers. I've always had this thought and wondered why no one has implemented it yet? The big deal lately is all around Android Tablets, so I ask myself, why doesn't someone develop an accessory that turns any Android phone into a tablet. Ok, here's what I mean, I have an HTC Evo and love the phone, but oft times I find myself wanting the new Galaxy Tab by Samsung. Then when I think of it, the Galaxy Tab is basically a phone with a bigger screen. So why can someone design and sell a multi-touch screen that has a slot and connectors on the back that I could slid in my Evo and everything that would appear on my Evo's screen now appears on the larger screen. Now my Evo is a Tablet with all the access to the all the apps and functionality of the phone, it's just using a bigger screen.
The external screen would also have to contain a front camera but could use the rear camera and flash LEDs of the EVO if you left them exposed. Another option would be to include a battery in the larger screen for longer battery life.
What do you thing?