At the moment if you want to buy a Phablet aka a big screen mobile, your best bet is clearly the Samsung Galaxy Note 2. It has a striking screen, lightning quick processor and one of the best cameras on a mobile.
There's also a good selection of cases available for the phone too
Check these out.
OtterBox Defender Case White/Grey - Glacier £30
This case offers three layers of protection including a polycarbonate inner layer and silicone outer layer. It comes with a belt holster featuring a swiveling belt-clip that will hold the device with the screen facing in or out. Handtec