Android or BlackBerry or Iphone or Java or Pocket Pc or Smart Phone or Symbian

[Mani]

or Windows Mobile? Which one of the following is the best?
Which one of the following is cheapest in India(Tamil Nadu)?
Is Pocket Pc and Windows Mobile are the same?
Is Wifi and WLAN are the same?
Free calling via internet to internet requires Wifi or 3G or anything other?
Is the GPS is a downloadable software or a mobile handset's inbuild software like bluetooth,infrared and WLAN?

 

[Brandon]

I think iphone u could get iphone 4 for 200 16gb and im pretty sure they have a 8gb for 100 dollars i think cuz the 3gs has 8gb