Hey guys,I am planning on buying a blackberry or a smartphone for my dad.He has an Airtel connection and no plans to change unless he can keep his number as well.Now I have a few questions;1. Which device is the best? (He needs it for emails/stocks/phone calls and messages etc)2. How much is the charge for using internet?3. How much is the extra charge?4. Can he buy any mobile and use Airtel with it?5. Anything else I should know?ThanksCrazysah