Now this error is common when the settings are not correct either in the mobile or on pc. Check BSNL Website or other pages from my site for getting info on how to configure your phone. the error message
Error 734 The PPP link control protocol was terminated.  can be easily removed by making minor changes to pc suite settings

PC configuration

 

 With Nokia PC Suite

 

Install software (PC suite & cable driver).

 Click on Internet settings in PC suite

1. Click on settings in one toucch Acess in Nokia PC Suite

2. Select  Modem of Mobile Modem (eg: Nokia  N72 USB Modem) and  press Next

3. Click on Configure Manually and press Next

4. fill the blanks like

Access point: gprssouth.cellone.in OR bsnlnet

UserName:  Mobileno (9194xxxxxxxx)

Password:  Mobile no (9194xxxxxxxx)

and press finsh