Yes you are right , you can use a GPRS enabled mobile phone as a usb modem.But whenever you buy an electronic item
be very conscious about the reason for which you are buying that item.
Let me explain.......
Actually it is a common misconception that a mobile phone being a wireless device will result in a greater data
transfer rate as far as the internet is concerned . But the speed depends on the bandwith offered by the service
provider Hutch,Airtel etc.So the actual speed of even Hutch is only 3.5 to 4 Kbps.Whereas the speed which I get on
my VSNL Dial up Connection is 48 Kbps . So it will be a mistake to buy a mobile phone to surf the net.
Costs involved in a modem based Connection -
Dlink 56 Kbps External Modem - Rs . 1500/-
VSNL 100 Hours Connection - Rs.853/-
BSNL Pulse Rate - Rs.1.20/180 seconds ( this cost is huge . Though it depends on the period of internet connectivity )
Total Cost - Rs . 2353/-
Mobile Phone based connection -
Mobile Phone Handset ( Benq M560G ) - Rs . 4450/-
Service Provider Subscription ( Airtel Postpaid ) - Rs . 500/- per month ( assuming minimal calls )
GPRS Subscription Charges - Rs.100/- per month ( in Pune )
Total Cost - Rs.5050