Thanks to all for providing the information. Since there is no broadband connectivity in my area, I am bound to have the Internet access through GPRS based solutions. Can somebody reply the following: 
1.  Is the connectivity depends on handset, one is using? 
2. Can I browse yahoo and other https sites, without much(more then 5 sec) waiting time? 
3.  What is the actual speed somebody has experienced using this device? (I am not OK, if answer is less then 10 KB/S)