Before going to have PDA cell phone, I would like to have some ideas about the PDA cell phones. is it different from a Smartphone? I have visited some web portals and found that PDA is a mini computer that helps you in many ways. If I own a PDA handset, would it be a small replacement of my laptop? Such questions have confused me. Please help me. It must have some advantage and disadvantage. Please share all the important information so that I can understand it well.