What is an unlocked Blackberry Torch phone?

An unlocked Blackberry Torch phone is a phone unlocked by the manufacturer to work on any SIM card from a compatible GSM carrier. There's no need to sign a service contract, and you may switch carriers whenever you want. It can use any SIM cards, which makes it easy to operate when traveling internationally. It won't work with CDMA networks that don't use SIM cards.

Which is better: the Blackberry Torch 9800 or the Blackberry Torch 9810?

If you want a nifty phone with decent specifications for a reasonable price, the Blackberry Torch 9800 suits your needs. It has a longer battery time and looks just like the Torch 9810. If you want a mobile phone with a faster processor, larger storage capacity and better display, choose the Blackberry Torch 9810. It's also capable of recording 720p high-definition videos and has face detection and multishot functions.

Should I get a leather pocket case or a hard-shell case for my Blackberry?

If you need a case that protects against occasional falls, dust and other elements, go for a hard-shell case. If you like the original look and feel of your phone, check out a leather pocket case that provides easy access to the screen.