I have found a new way of using free gprs service from Warid. The method is new and working. The trick is still in beta mode and i am still working on it to make it better. At current you can only open Google and Facebook with this trick.
First make sure you have at least 3 RS in your account. Then open Google and Facebook and save them. After saving them go to settings of your mobile and change your internet settings:
Connection Name: Warid beta
IP Adress:
Port: 9201
APN: wap.warid
Authentication: no
Username: N/A
Password: N/A

Save these settings and restart your mobile. Now open the save page and start surfing. You can download images using Google image search totally free. Download limit is 300 KB. You can even use Facebook with this trick. This works on default browsers only.
If any one of you is expert in this stuff, then please try to make this trick more use full.
Leave a comment if you are facing any problem.