My friend has got a Blackberry Pda cell phone which looks really nice but i really don’t know what exactly is the difference between normal phone and a Pda cellphones and i really don’t want to bother my friend. Do any one here also uses a Pda cellphone or any one really have some information about the key differences.I like to know whether it really makes any difference to use Pda cell phones than normal phones. If you could mention some authentic information resource that would also be great.